Re: Yet another radon / insulation question
The first question to ask --- have you had a test done to see if you indeed have a problem with Radon?
Originally Posted by NH_Jim
Radon is more of a concern in homes with basements that are directly coupled to the rest of the home. If the living space doesn't have regular air exchange then a buildup of radon gas as well as other contaminants can be an issue for indoor air quality.
Usually crawl spaces are not directly coupled to the living space. Unless there are seveal leaking points of entry then Radon shouldn't normally be a concern --- if there are leaks from the crawl space then you have other issues like heat loss and moisture issues. Radon in a crawl space could be controlled with simple air exchange with vents.
Also , laying plastic down on the dirt floor of the crawl space will also keep moisture issues down but will help with limiting any Radon gas. You could use foam in a can to adhere the plastic to the foundation wall --- you just need a thin bead because it will expand.
Yes , insulating the perimeter walls of the crawl space will go a long way to help keeping the temperature inside the crawl space more regulated --- helping to keep your floors warmer. Combined with insulating the underside of the floors will greatly increase your comfort.
Fiberglass is not an organic material --- mould lives on organic material.
Ideally, if you could attach rigid foam boards to the underside of the floor joists and fill in the joist bays with batt insulation would be a great way to insulate.
If you can't attach the rigid foam ensure you install something to hold the batts in place , otherwise they will sag and fall out.There are wire retainers available that are wedged in between the joists , wire coat hangers repurposed for this also works. Cut them in 16 inch lengths --- these will be longer than the space between joists ---- place them diagonally in between the joists to wdge them in place. The more the better to help holding the batts in place.
I don't believe a radiant barrier would be of much use in this case. There isn't much radiant heat concern here.
2 cents worth.
"" an ounce of perception -- a pound of obscure "