Wonderful !!! a great option first to protect my family's land with perimeter fences and then to replace the adobe house destroyed by time. Watching your videos I'm starting to buy equipment and material. A solution to Low incomes families of Peru , nowadays who do not have access to such expensive and monopolistic construction materials. Thanks Honey Do Carpenter !!!! Regards from Arequipa- Perú !!!
i am new to your channel. You are a brilliant man. I can tell how much you love life in general but its clear how you love your family also. You are simply amazing. i am a retired. Now disabled former Building contractor. I built New Homes with a specialty in creative Projects. Murals , Faux Finishes, Custom Tile and custom build ins were daily staples . Yet i am still amazed at what you do! I did my fair share of Faux Rock Facades and Air crete would have be great to know about back 20 years ago. You are just the kind of person who i could have benefited knowing about? Unfortunately today i am limited due to stage 5 kidney failure and after 10 years ; its been hard seeing my abilities become reduced to living from a wheelchair . I can still do somethings from my chair but i enjoy watching smart people do creative things even more now. your channel has become an inspiration to me. I am a person of faith which gives me hope. Your channel reminds me of how i used to consider my projects-from an engineering standpoint. I simply want to humbly thank you for being who you are; a humble kind man, filled with love and energy to accept the challenges of life with vigor. You bring back so many memories. Sincerely, Art of W. Tennessee
Wow, I would like to say thank you for all of your research. Your talking about the money that you have saved to build this. I would like to consider the total amount of money you have saved all of us viewers! Priceless!!!
Aloha HDCS, A woman by the name of Virginia Macdonald moved to Hawaii after wwii wrote a book on natural heating and cooling. She used slots in flooring or small louvered windows in wall bases to pull in cool air, that was exhausted out of the roof similar to your vent. The firehouse in volcano,hi was built following her design. They have no damp or moldy equipment or hoses. Keep the lamp lit 👍🏻 mahalo,mas
It would be interesting to see the heating and cooling cost. How about an insulated foundation block system filled with your air crete? It should be off the charts
You have developed an amazing building system but your video leaves one question unanswered. Can you please tell us how the panels are connected to each other and secured to the slab? Many thanks for sharing what you have learned.
Hey thanks for the breakdown. I really enjoyed when you did this shed project last yr. I’m still planning to mess around with aircrete when I get my other projects caught up. 😁
Nice work I am considering building a greenhouse with foamcrete in the future. I am thinking normal concrete perimeter foundation, with the south facing stem wall, back and end walls all done in foamcrete. Then a floating slab of foamcrete that would come to approximately 2 inches below grade inside. Followed by a standard 4 inch slab on top of that with radiant heat built into it. probably glazed with twin wall sheeting.
Thats amazing. I wish i would have found out about this before i got disabled there are soooo many projects around the house i could have used this for.
Craig You are so correct I am 73 and disabled (NAM). I use a mobility scooter and no longer can garden conventionally. I want to make raised beds this way. I will grow hither fro in what ever - then I will try to build panels. If I can I will 1 panel at a time build a shed.
Hey Darwin What would be the best curring process or practices for the aircrete panels? Nevada, where I'm at, gets hot. So would they dry out too quickly to cure properly? Also, I know you made a video on your custom sheet metal stud idea. How is that going? How would they be made?
Wow. Nice black roof--surely in winter you could vent the roof space air INTO the shed to heat it, by adding a small plenum at the ridge (but also removing ridge vent) with a baffle to direct air out the ends or down tubes to the interior floor. ? Somewhat like a solviva roof but no glazing.
You are brilliant buddy. Thanks so much for posting these videos. 1.Have you ever considered adding PEX pipe to absorb the heat of the roof and walls to use to heat a hot tub or pool? 2. Also can you use the panels for the roof? You would probably add more thickness and rebar and/or chicken wire for reinforcement.
Well aircrete it is then.. So foundation and structure should be regular concrete on a house with multiple floors, and fill the rest up with aircrete?? Can aircrete support loads? Like if you were to use it as a tunnel or a bridge, can you do it with aircrete? Really cool stuff!
I was thinking about doing the "Box Frame" version on this to cut down on studs by 33% give or take. Can you tell me how much 1 panel weighed in lb? If i missed this in previous content sorry to bother. So the object would be to box frame a whole wall on the ground, fill the cells one at at time. Get some help and then raise the walls and put some temp support up. I used to do this as a rough wood framer doing second stories so we didn't have to put the wall board on a second story with scaffling.
Ok Been following along and I'm quite impressed! But I haven't seen the test done that would sell me over the top, and that is... What is the thermal protection from cold?
Can stack or layer aircreet in multiple pours. You know, kinda how they do with hempcrete, or adobe. If so, or long to you wait til it's safe for the next pour? I'd imagine it would have to cure for a time before the next pour...if it's possible at all.
I am toying with the idea downsizing and retiring. I have looked at a cob construction. I understand some put cement with the cob. Do you think aircrete could be layered of on the outside and maybe even the inside of the outside wall? Would that be effective.
Excellent, informative video! Thanks for doing the research and math for a comparison. One question...is this method easier than building the forms in place to pour the entire structure at one go?
If the forms in place were shallow, then they would be "slip forms". Meaning slide up for the next pour. Using this strategy a cement curing agent like CSA (Calsium Sulfo Aluminate) will allow the whole building to be poured in one day. Mr Honey Do's panel approach will allow for delivery onsite of preconstructed pieces to be assembled.
Jeremy Hershberger I don’t know what size you’re thinking. I just did a 10x16 with board and batten siding but it’s not on a concrete slab. I just did mine on skids on a gravel pad and concrete blocks since I want to be able to move mine if need be.
I really love your channel, and the work that you do! I have a question, can you drill into the slabs on the inside of the shed to hang cupboards, and install a work bench, etc.? Are the panels susceptible to cracking if you were to drill in?
I would not hang anything structural on the panel itself. similar to how you wouldn't hang a cupboard fastening into sheet rock. You would need to use the studs for that just as you would in any building.. No the panels will not crack if you drill or screw into them. they do make special screws for light weight concrete of hardened plastic and they kind of look like a small auger, thes can be used for lighter duty like picture hangings, however shelves or any thing structural would need to be fastened into the studs. Thanks HDC
Great work and nice atmosphere you created in these videos, at least you have balls and try things out with lots of easy to understand clips, maths and info, Cheers from George K Australia
I have been wondering how much that cost. Thank you for doing this video. I remember you mentioning a lot of your side questions about water pH levels for the foam. I was wondering if you could use the refractory mix and make some sort of a still To boil water and make your own distilled water.
Thank you so much for all of your videos!! I am hoping to try a building project of my dream cabin. Negotiating the land now... I don't think I would have moved ahead with purchasing the land had I not come upon all of your contribution to this amazing product! Would you recommend pouring an Aircrete foundation? The area where I am looking at has alot of clay soil and they have cob buildings in the village. A lodge in the community does cob building workshops. Do you think you could mix clay with the Portland cement to give it more of an Adobe building look? What about adding straw? That's, I watched the AircobCrete video on the raised beds. Thanks again for all your incredible work and passion!
I would reccomend a aircrete structure with a cob siding or outer layer for the look. best of both wordlds, structural integrity , insulation, solar mass and a cool look. thanks HDC
The notches Mr Honey do created at the apex of his gable ends would make for good lincoln log nested notches construction joining. Otherwise there is a commercial mold that does make actual lego blocks of air crete.
Actually, I will never understand why the various styrofoams are not ground up to an effective fineness (perhaps like that of perlite) and widely marketed in bags as an additive for lightweight concrete. Perlite concrete is, after all, the original aircrete, so the concept seems workable. We could get the styrofoams out of our landfills and perhaps need less cement production, since we know how energy intensive that industry is. That would eliminate the problem often mentioned about aircrete - maintaining the soap foam in a sufficiently cohesive state so as to allow for a thorough mixing in the wet mix. Styrofoam would obviously stay solid throughout that process. Sure, I've seen failed attempts at ''styrocrete" on RUclips, but different grinds of styrofoam were not used.
@@grantmyers7593 - I've seen that. Plastics of all kinds seem to be the biggest landfill problem. They don't offer much for recyclable plastics, so a lot of people just toss them in the trash. It does seem like a lot of ground plastics might work as concrete or asphalt additives. Whatever can be done, including worms, to bring a profit incentive to the problem will be a gift to future generations.
Steve, in the title of your next video, consider replacing the words 'garden shed' with 'tiny house'. I predict 10x increase in views. What do you predict? Thanks for sharing all your fine work in detail! You are a great communicator.
Why were the bags of cement (concrete?) for the footer only $3.60, but bags of cement for the aircrete $12? When I saw you list the price of a bag of cement as $3.60, I was in shock, oh man I've been overpaying for cement! But $12 sounds about right.
A fine silica particle distribution into the mix and a longer term wetting, to secure the silicon-calicium bonding; should eliminate the need for an auminum frame for each panel. The Roman's used volcano ash, with high silica content, to construct their 'Roman Aqueducts', that are still standing today. Although a larger the volcanic ash represents a larger particle, the same silicon-calicium bond incorporation is what give the high strength and performance to the final product. Note, the silica particle size needs and wetting time and other undetermined parameters need experimental determination. A safety precaution: fine silica particles will cause lung damage!
Today's equivalent of volcanic ash is fly ash, a byproduct of steel making or electricity generation. Fly ash has been approved for use in interior wallboard. Adding some hydrated lime in such a fly ash cement mixture would increase the strength, but lengthen the cure time
@@michaelglenning5107 perhaps, at the integrity of the molecular structures. The fly ash has undesirable constituents, but will work at the cost of a thicker panel and more weight. A finer more consistant mixture there is more surface area on a grounded fractured silica per particle in this concrete mix. The crystalline lattice structures stronger covalent bonding would need a longer cure time, wetting, temperatures also are more critical factors also. This would require more experimental data.
You FINALLY tell us prices then leave out the SIZE of the panels so we still have no way to know how much per square foot... Btw can you audio level control your vids please. Great work your doing but hard to reproduce results without needed dimensions and specs.
Mr Honey do does give the shed dimensions (height, length, width) and the number of panels. We know the panel thickness. All the information you need is presented.
I stopped watching because your cost breakdown is incorrect. You cannot calculate by square foot if you can't purchase it that precisely. The cost breakdown should include all required items actually purchased. While it's a cool project this is not a cost analysis.
Aloha HDCS, A woman by the name of Virginia Macdonald moved to Hawaii after wwii wrote a book on natural heating and cooling. She used slots in flooring or small louvered windows in wall bases to pull in cool air, that was exhausted out of the roof similar to your vent. The firehouse in volcano,hi was built following her design. They have no damp or moldy equipment or hoses. Keep the lamp lit 👍🏻 mahalo,mas
Wonderful !!! a great option first to protect my family's land with perimeter fences and then to replace the adobe house destroyed by time. Watching your videos I'm starting to buy equipment and material. A solution to Low incomes families of Peru , nowadays who do not have access to such expensive and monopolistic construction materials.
Thanks Honey Do Carpenter !!!!
Regards from Arequipa- Perú !!!
i am new to your channel. You are a brilliant man. I can tell how much you love life in general but its clear how you love your family also. You are simply amazing. i am a retired. Now disabled former Building contractor. I built New Homes with a specialty in creative Projects. Murals , Faux Finishes, Custom Tile and custom build ins were daily staples . Yet i am still amazed at what you do! I did my fair share of Faux Rock Facades and Air crete would have be great to know about back 20 years ago. You are just the kind of person who i could have benefited knowing about? Unfortunately today i am limited due to stage 5 kidney failure and after 10 years ; its been hard seeing my abilities become reduced to living from a wheelchair . I can still do somethings from my chair but i enjoy watching smart people do creative things even more now. your channel has become an inspiration to me. I am a person of faith which gives me hope. Your channel reminds me of how i used to consider my projects-from an engineering standpoint. I simply want to humbly thank you for being who you are; a humble kind man, filled with love and energy to accept the challenges of life with vigor. You bring back so many memories. Sincerely, Art of W. Tennessee
i truly am amazed at what you were able to do for such a low cost.. incredible ad man oh man do i wish i had the skills to do this myself
The price breakdown was super useful for anyone thinking about a project. You guys are inspiring.
Wow, I would like to say thank you for all of your research. Your talking about the money that you have saved to build this. I would like to consider the total amount of money you have saved all of us viewers!
Priceless!!!
Thanks to you and others I poured my first aircrete panels today for a workshop i'm building. Keep it up guys.
Aloha HDCS, A woman by the name of Virginia Macdonald moved to Hawaii after wwii wrote a book on natural heating and cooling. She used slots in flooring or small louvered windows in wall bases to pull in cool air, that was exhausted out of the roof similar to your vent. The firehouse in volcano,hi was built following her design. They have no damp or moldy equipment or hoses. Keep the lamp lit 👍🏻 mahalo,mas
Oh man, this is just what I needed! Can’t wait to build my own workshop/mancave!
Thank you for everything you have done to make it easier for the rest of us.
Excellent video... loved all the detail and itemization of expenses. Thanks!
God bless you for all your hard work and kindness to share your info.👍🏼
How do you connect the panels together
It would be interesting to see the heating and cooling cost. How about an insulated foundation block system filled with your air crete? It should be off the charts
You did it yeah!!!
Looks amazing!!!
Thank you for the video
You have developed an amazing building system but your video leaves one question unanswered. Can you please tell us how the panels are connected to each other and secured to the slab?
Many thanks for sharing what you have learned.
John SmithIII I think he covers that in videos from last year if you search his channel.
Wow, fantastic overview of the material and cost for the project. Clear and to the point. 👈😎👍Thanks.
Hey thanks for the breakdown. I really enjoyed when you did this shed project last yr. I’m still planning to mess around with aircrete when I get my other projects caught up. 😁
That's awesome. Thanks. I'm putting a foam maker of my "honey do list "
Did you ever think about making the roof out of aircrete and waterproofing the topside with rinoliner or something similar just an idea to toy with
Hello from Luther, Texas. Great job Darwin!!!
Nice video but you compared your DIY aircrete shed to a retail purchased shed. A DIY stick timber shed would probably be comparable cost.
Very Good!!!
Genial man you have a new suscriptor. I like you way of work Saludos desde Durango México
In your panel you use steel metal stud. In this case how do you fight from a thermal bridge, also called a cold bridge?
Nice work I am considering building a greenhouse with foamcrete in the future. I am thinking normal concrete perimeter foundation, with the south facing stem wall, back and end walls all done in foamcrete. Then a floating slab of foamcrete that would come to approximately 2 inches below grade inside. Followed by a standard 4 inch slab on top of that with radiant heat built into it. probably glazed with twin wall sheeting.
Thats amazing. I wish i would have found out about this before i got disabled there are soooo many projects around the house i could have used this for.
Craig You are so correct I am 73 and disabled (NAM). I use a mobility scooter and no longer can garden conventionally. I want to make raised beds this way. I will grow hither fro in what ever - then I will try to build panels. If I can I will 1 panel at a time build a shed.
@@billsartelle353 go for it sir. Never give up just do what you can when you can. Ill pray for your success.
@@craigjacob3704 Thanks Craig. Would love to chat sometime. Look me up on face book.
That is so impressive!! Thanks for itemizing the costs, I can now compare those to my local costs. :)
Hey Darwin
What would be the best curring process or practices for the aircrete panels?
Nevada, where I'm at, gets hot. So would they dry out too quickly to cure properly?
Also, I know you made a video on your custom sheet metal stud idea. How is that going? How would they be made?
follow procedure and cover with visqueen
Good job!
Wow. Nice black roof--surely in winter you could vent the roof space air INTO the shed to heat it, by adding a small plenum at the ridge (but also removing ridge vent) with a baffle to direct air out the ends or down tubes to the interior floor. ? Somewhat like a solviva roof but no glazing.
Great video!
This is fabulous :-) One question: You said this install is including isolation. You mean the walls are already insulating since you use aircrete?
Yea. the aircrete is up to 3.5 r value per inch of thickness
You are brilliant buddy. Thanks so much for posting these videos.
1.Have you ever considered adding PEX pipe to absorb the heat of the roof and walls to use to heat a hot tub or pool?
2. Also can you use the panels for the roof? You would probably add more thickness and rebar and/or chicken wire for reinforcement.
great work, i'm just wondering if you have the numbers on your formula of aircrete. Like the R-Value inch, as well as the psi?
Hey there, just discovered you guys last night. I wonder what these materials would come out to today, more than a year later?
Nice! 👍
Well aircrete it is then..
So foundation and structure should be regular concrete on a house with multiple floors, and fill the rest up with aircrete??
Can aircrete support loads? Like if you were to use it as a tunnel or a bridge, can you do it with aircrete?
Really cool stuff!
I was thinking about doing the "Box Frame" version on this to cut down on studs by 33% give or take. Can you tell me how much 1 panel weighed in lb? If i missed this in previous content sorry to bother. So the object would be to box frame a whole wall on the ground, fill the cells one at at time. Get some help and then raise the walls and put some temp support up. I used to do this as a rough wood framer doing second stories so we didn't have to put the wall board on a second story with scaffling.
How is concrete-to-metal contact not a problem? How can I talk my inspector into letting me make a similar shed with aircrete?
How much did your standard panel weigh and what was its size. I need to build a higher wall and need to know whether i will be able to lift it Thanks
Panels were 3.75" x 94" x 16", each panel weighs 75-80 lbs Thanks HDC
Great Video Dar!
Got foammate this week really nice way better than the one I built thanks
Ok
Been following along and I'm quite impressed!
But I haven't seen the test done that would sell me over the top, and that is...
What is the thermal protection from cold?
Can stack or layer aircreet in multiple pours. You know, kinda how they do with hempcrete, or adobe. If so, or long to you wait til it's safe for the next pour? I'd imagine it would have to cure for a time before the next pour...if it's possible at all.
I am toying with the idea downsizing and retiring. I have looked at a cob construction. I understand some put cement with the cob. Do you think aircrete could be layered of on the outside and maybe even the inside of the outside wall? Would that be effective.
Excellent, informative video! Thanks for doing the research and math for a comparison. One question...is this method easier than building the forms in place to pour the entire structure at one go?
If the forms in place were shallow, then they would be "slip forms". Meaning slide up for the next pour. Using this strategy a cement curing agent like CSA (Calsium Sulfo Aluminate) will allow the whole building to be poured in one day.
Mr Honey Do's panel approach will allow for delivery onsite of preconstructed pieces to be assembled.
This is great. Could you compare the cost of this shed to a do it yourself stick frame shed?
Jeremy Hershberger I don’t know what size you’re thinking. I just did a 10x16 with board and batten siding but it’s not on a concrete slab. I just did mine on skids on a gravel pad and concrete blocks since I want to be able to move mine if need be.
@@SmartEasyDIYer how much did that end up running you?
That was very cool! Well done!!!! :)
I really love your channel, and the work that you do! I have a question, can you drill into the slabs on the inside of the shed to hang cupboards, and install a work bench, etc.? Are the panels susceptible to cracking if you were to drill in?
I would not hang anything structural on the panel itself. similar to how you wouldn't hang a cupboard fastening into sheet rock. You would need to use the studs for that just as you would in any building.. No the panels will not crack if you drill or screw into them. they do make special screws for light weight concrete of hardened plastic and they kind of look like a small auger, thes can be used for lighter duty like picture hangings, however shelves or any thing structural would need to be fastened into the studs. Thanks HDC
Great work and nice atmosphere you created in these videos, at least you have balls and try things out with lots of easy to understand clips, maths and info, Cheers from George K Australia
I have been wondering how much that cost. Thank you for doing this video. I remember you mentioning a lot of your side questions about water pH levels for the foam. I was wondering if you could use the refractory mix and make some sort of a still To boil water and make your own distilled water.
You got nice flooring in front of shed
How to make those?
This is very interesting what would it cost using aircrete to make a small 825 SF cottage with a car port?
There are a whole lot of well it depends in that question. Using HDCs panel technique or others, height of wall, windows, types of doors, roof, etc
Thank you so much for all of your videos!! I am hoping to try a building project of my dream cabin. Negotiating the land now... I don't think I would have moved ahead with purchasing the land had I not come upon all of your contribution to this amazing product!
Would you recommend pouring an Aircrete foundation? The area where I am looking at has alot of clay soil and they have cob buildings in the village. A lodge in the community does cob building workshops. Do you think you could mix clay with the Portland cement to give it more of an Adobe building look? What about adding straw? That's, I watched the AircobCrete video on the raised beds.
Thanks again for all your incredible work and passion!
I would reccomend a aircrete structure with a cob siding or outer layer for the look. best of both wordlds, structural integrity , insulation, solar mass and a cool look. thanks HDC
Good video thanks ehhh
Would aircrete work for a small fireplace on the patio? It would be nice to "lego" it so if I change my mind...😉
The notches Mr Honey do created at the apex of his gable ends would make for good lincoln log nested notches construction joining. Otherwise there is a commercial mold that does make actual lego blocks of air crete.
What software are you using for planning your build?
Im working on an addition to my garage with sub compartment (root cellar)
sketchup
Wow-ah!!!
Actually, I will never understand why the various styrofoams are not ground up to an effective fineness (perhaps like that of perlite) and widely marketed in bags as an additive for lightweight concrete. Perlite concrete is, after all, the original aircrete, so the concept seems workable. We could get the styrofoams out of our landfills and perhaps need less cement production, since we know how energy intensive that industry is.
That would eliminate the problem often mentioned about aircrete - maintaining the soap foam in a sufficiently cohesive state so as to allow for a thorough mixing in the wet mix. Styrofoam would obviously stay solid throughout that process. Sure, I've seen failed attempts at ''styrocrete" on RUclips, but different grinds of styrofoam were not used.
or mealworms eat Styrofoam, we could recycle it that way too.
@@grantmyers7593 - I've seen that. Plastics of all kinds seem to be the biggest landfill problem. They don't offer much for recyclable plastics, so a lot of people just toss them in the trash. It does seem like a lot of ground plastics might work as concrete or asphalt additives.
Whatever can be done, including worms, to bring a profit incentive to the problem will be a gift to future generations.
Steve, in the title of your next video, consider replacing the words 'garden shed' with 'tiny house'. I predict 10x increase in views. What do you predict? Thanks for sharing all your fine work in detail! You are a great communicator.
Why were the bags of cement (concrete?) for the footer only $3.60, but bags of cement for the aircrete $12?
When I saw you list the price of a bag of cement as $3.60, I was in shock, oh man I've been overpaying for cement! But $12 sounds about right.
Great job. Havent worked with aircrete yet. Can you drive nails & screws in it? Do you know its R value?
R value is variable depending on thickness, and foam density, so everyone's panels will be conceivably a little bit different.
Someone commented, that it's around 3.5R per inch of thickness for aircrete.
The metal studs are much higher cost now
If you made the roof out of AIRCRETE panels and metal roof it would be insulated and fireproof.
A fine silica particle distribution into the mix and a longer term wetting, to secure the silicon-calicium bonding; should eliminate the need for an auminum frame for each panel. The Roman's used volcano ash, with high silica content, to construct their 'Roman Aqueducts', that are still standing today. Although a larger the volcanic ash represents a larger particle, the same silicon-calicium bond incorporation is what give the high strength and performance to the final product. Note, the silica particle size needs and wetting time and other undetermined parameters need experimental determination. A safety precaution: fine silica particles will cause lung damage!
Today's equivalent of volcanic ash is fly ash, a byproduct of steel making or electricity generation. Fly ash has been approved for use in interior wallboard. Adding some hydrated lime in such a fly ash cement mixture would increase the strength, but lengthen the cure time
@@michaelglenning5107 perhaps, at the integrity of the molecular structures. The fly ash has undesirable constituents, but will work at the cost of a thicker panel and more weight. A finer more consistant mixture there is more surface area on a grounded fractured silica per particle in this concrete mix. The crystalline lattice structures stronger covalent bonding would need a longer cure time, wetting, temperatures also are more critical factors also. This would require more experimental data.
Those metal studs are 3x the price now.
You FINALLY tell us prices then leave out the SIZE of the panels so we still have no way to know how much per square foot... Btw can you audio level control your vids please. Great work your doing but hard to reproduce results without needed dimensions and specs.
this, price per cubic foot or cubic yard of panel would be a nice break down.
Mr Honey do does give the shed dimensions (height, length, width) and the number of panels. We know the panel thickness. All the information you need is presented.
@@michaelglenning5107 very true
wow! this is just so cool ! i love you! i want to meet you! where are you?
Build a whole house this way. That mobile home in the background was a waste of money. You could have a real house for less. Great video.
6:50 ventilated roof
this could be huge in poorer countries too
Cement only $3.00 a year ago
The cha-ching sound effect was way too annoying. Couldn't even get through two minutes of the video. LOL
The loud cash register sound is extremely annoying. Sorry.
: )
cash reg sound in headphones is BRUTAL.... thank about that next time you do one of these - its bloody annoying ( and louder than your voice )
I stopped watching because your cost breakdown is incorrect. You cannot calculate by square foot if you can't purchase it that precisely. The cost breakdown should include all required items actually purchased. While it's a cool project this is not a cost analysis.
Aloha HDCS, A woman by the name of Virginia Macdonald moved to Hawaii after wwii wrote a book on natural heating and cooling. She used slots in flooring or small louvered windows in wall bases to pull in cool air, that was exhausted out of the roof similar to your vent. The firehouse in volcano,hi was built following her design. They have no damp or moldy equipment or hoses. Keep the lamp lit 👍🏻 mahalo,mas