Rigid foam boards / Discussions

...foam out - toxic. So are some rigid foam boards. Family very concerned. You mention a new type of friendly board. What can I use that is safe, R-20 at least ? Thank you.

...foam board to the inside of the wall or leave a gap for air? I understand mold will not grow on the board but I am afraid that there are very small cracks in the mortar in-between some of the blocks and don't know if this will affect anything.. I found a tiny stream of light coming through only one block and had to sea...

...foam insulation in the current wall framing followed by drywall to achieve proper vapor barrier against the block and insulation? We'd rather not remove the 2x4's (and metal tracking) to get 2" of rigid foam board against the block and have to reframe the walls. Thank you in advance for your help.   Is the block discol...

...foam, this page should tell you all you need to know –  How to Insulate Exterior Walls from the Outside Another idea and product comes to mind, if it’s a farm house I’m assuming you have wiggle room to make the wall thicker without affecting propertly line setbacks? If so, here is my thought – a thick panel of rigid fo...

...foam insulation on basement walls is not a bad one. However, spray foam itself is a vapour barrier, so you wouldn’t need to apply a typical 6 mil polyethylene vapour barrier on the wall after the foam (though in some areas building inspectors may actually require it). And if you do choose to spray foam your basement wa...

...Foam Board Insulation over the bare concrete and leave the framed walls insulated as the are? 2. Install Foam Boards over the concrete and replace the foam in between the studs and maybe even put the existing fiberglass batt insulation back in the cavities over the foam? 3. Leave it as is and insulate the new wall that...

...foam strip! So - as we want to use the space in the basement, what are the suggested steps to reduce the humidity? What should we put on the uninsulated floor as a covering that won't go moldy/smelly like the carpet has (and we're on a budget, and have next to no headroom.) I appreciate there's no perfect solution - bu...

...rigid insulation against the wall to keep the moisture out. You have probably seen a few of the following pages but I’ll add them in case, and for anyone else reading along.  Preventing mold when you insulate your basement Building better basements: how to insulate your basement properly   How to Control Radon Ga...

...rigid foam to Install two inches of rigid insulation board directly against concrete.  A mold expert told me to put the board on top of the framing, not directly onto the concrete wall so the house can breath.  What is the right course of action? Thank you Can you please explain a bit better what the mold expert told y...

...boards for installation in my basement rim joists, should I be looking for faced or unfaced foam boards to install there--and which surface of the boards (faced or unfaced) should be installed toward the outside? Thanks! Great that you are thinking this out carefully, but when it comes to the choice between XPS and EPS...

...foam insulation has failed? It's hard to ever weigh in on a problem with complete confidence without seeing a project or knowing the full wall assembly, but if anything, that may actually show a 'success' of the spray foam rather than a failure. The wood studs will transfer far more heat than the Spray Polyurethane Foa...