Why is Spray Foam Insulation a Problem
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- Опубликовано: 3 июн 2024
- Our experienced surveyors at Harrison Clarke are often asked for information on spray foam roof insulation and how it might affect the structural integrity of properties. In this video we look at what spray foam insulation is, why it could pose problems for your building, and the importance of seeking advice from qualified Building Surveyors.
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Timestamps
0:00 Introduction
0:12 What is Spray Foam Insulation?
0:46 Is Spray Foam Insulation a problem?
1:24 Why do lenders and surveyors see Spray Foam Insulation a problem?
3:47 I have Spray Foam Insulation installed, What next?
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I would think if you want to avoid lender issues ( mortgage) don't spray foam your attic. Also, you won't know if you have water issues until a lot of damage has been done.
Just my opinion. I think the mortgage issue seems to be in the UK
Good info, thanks
Thank you! 🙏
I've never had a problem selling homes with spray foam insulation, nor have I heard of lenders rejecting a spray foam insulated home in my area (zone 6a). I've had fiberglass insulated homes that had mold issues due to the fact that most batt insulators don't take the time to get the batts into very tight spaces at corners or around windows or in stud spaces that are way less than the width of the batts. By smashing batt insulation into small spaces, the insulation value drops due to compression and you can get condensation. Interior plastic sheet vapor barriers get punctured with drywall screws, poor insulating detail around receptacles and homeowners punching nails through to hang stuff on walls. Without insulation covering 100% of the sheathing and a proper continuous vapor barrier, condensation will form in colder climates. With spray foam, the foam expands into tight areas, so you are less likely to have any condensation issues and no vapor barrier is used because spray foam is the vapor barrier.
Closed cell spray foam also adds rigidity to walls. We gutted a 50 year old home and re-insulated with closed cell and there was no more wall creaking when it was windy.
Spray foam is superior to other insulations for filling small gaps and R-value per inch. Most new homes in my area have been using closed cell spray foam for many years with zero issues. The best practice, IMO, is to use Zip-R exterior insulated sheathing with the correct R-value for your zone. When the sheathing seams are properly sealed with Zip tape or liquid flash, the building envelope is airtight and watertight with no need for window bucks, furring strips or a WRB, as you'd need with XPS or EPS over sheathing.
Not all homes should use spray foam. Very old homes need their wall cavities to breathe due to air leaking cladding. Vapor permeable batts are a safer choice.
If your roof leaks, it's most likely due to having an old roof which needs replacing and that neglect is on the homeowner. When re-roofing, I'd rather need to replace some roof sheathing and maybe some roof truss repair than replacing rotting wall studs, hardwood floors or personal property if the roof leaks with batt insulation.
Hi Bob! This video was in reference to UK construction, we understand that US construction differs in regulation. Thank you for your comment! 🙌
It dosnt seem to be a problem in ireland? They say here dont spray to the felt and put in a 2 inch card. And there would always be a breeze coming between felt and foam that wouod dry and condenstation
We can only comment on our experience here in England. The creation of a continuous ventilated void using ‘card spacers’ between a high resistance underlay and the spray foam insulation with a vapour control layer (AVCL) on the warm side of the insulation may create a lower risk of condensation in accordance with the guidance of BS5250:2021. However, in our experience it is more common to find that the insulation has been sprayed directly onto the underlay or sometimes even onto the tiles or slates themselves. The installation of card spacers will be more time consuming which could increase the cost of installation. Ultimately unless the installation of the cards is fully documented it is difficult for a surveyor to determine if such cards are in place and/or have been installed correctly without intrusive investigations. Another point to consider is that creation of a 2” air gap below the underlay will limit the thickness of foam insulation which can be installed ‘between’ the rafters, particularly if these are less than 100mm in depth. Each case therefore needs to be considered on its own merits.
Create another certification.
So, the practical solution is to use spray foam on walls, and rigid foam or fiberglass beneath the roof?
We have not discussed the use of spray foam on walls but can consider this for future videos.
The use of mineral wool insulation to insulate roof spaces is normally more cost effective in our experience, however there may be some situations where spray foam is more practical or suitable to install. Each case should be carefully considered.
My builder just told me that the closed cell would go on the walls and the open cell foam beneath all 3 story roofs. I am just confused with this insulation.
Its well or better then well. I have used rockwool invented in USA i USA in 1953 or something.
Here You have the rain and will will repair Your roof or walls before its too late.
Nice RUclips
Imagine him speaking like that about women. "Crazy women are a problem and can create many serious problems." Well, that certainly is true, and all the sane women out there agree with that. But when only crazy women are being spoken of, the problems they cause get hung on ALL women.
Other countries have long histories with spray foam that are positive. Because it is easy to find responsible information on this subject today, it's alarming that any institutions in the U.K. would dare to push bad policies that are based on false claims.
what the hell has this to do with women? Do they cause dry rot?
Given the manipulative cold-callers I get, using scare tactics and telling lies, I doubt very much that the sprayers are 'well intended'.