Is this attached with some special glue? and how tight does it have to be to
the wall. My wall is a block wall, do i have to put caulk or something into
all the joints of the block?
Do the overlap joints on the xps need a caulk too?
My one basement wall is 90% above grade, and it is cold down here in the
basement 8-p. 15° C today and it is 8°C outside
Should I use 1" or 2" xps on walls? I will be using 1 " on floor. Location
is southern ontario.
EPS and XPS are made from the same plastic (polystyrene), but the process is
different. EPS begins as small plastic "beads" that are expanded and
together. It is the same as the white foam in many disposable coffee
begins as a continuous mass of molten material. It is familiar as the
used in trays for fresh cuts of meat at the supermarket.
yes, I concur that xps refers to extruded polystyrene (dow blue is a
common brand). architects in these parts use that abbreviation.
as for attaching it, it partly depends on what is going over it. you
do need to cover it because it will burn and release toxic gas if
exposed to flame. I'd recommend using as much foam as you can stand
and can afford. if you really want to do it right, use two layers and
stagger the joints. xps gives you about R 5 per inch. I don't think
glue is necessary.
you can get 2" metal z strips that hold the foam in place and are shot
onto the walls with powder actuated fasteners or short tapcons. I have
also used wood firring strips as wide as the foam is thick, and fit the
foam between the wood strips. i do this as i go --apply strip, then
foam, then another strip, etc so you can get a good fit witht he foam.
attach the wood strips with tapcons. you could even place the foam on
the wall and hold it in place with a 1x2 over the foam, though it would
take a very long tapcon. there is no one right way. if you are
putting up drywall, the metal z strips will work, but if you are using
wood panelling, you will want some wood back there to nail to.
i tape the seams with tyveck tape. caulk would do the same thing, but
the tape is easier and cleaner.
Im going to frame with 2x3, so I could just use the framing to hold it in
place? And if there is air gap somewhere behind xps and moisture gets
behind, it will not mould?( shouldnt happen , as I have had not one drop of
moisture in 3 years since moving in)
if you are worrying about moisture and mold, you definitely want to
keep anything that can feed the mold out of there (like wood or
fiberglass insulation). An airspace would also be a good thing. if you
have the foam tight against the block, that seems like more of a mold
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