Basement walls have "odd" coating on them (///AG)
We have a house (found calendars of 1943 on the support beams in the basement, this is probs its build age) its concrete pour, very flat floors, no cracks, very well built.
However i notice on the basement walls thereís a very white covering, some places it falls off like a chalk based covering, others it still sticks, itís around 1-2mm deep (1/25th = 2/25 inch deep), what is this?
Looks like an original vapour barrier maybe?
If a brush is passed over it and some will come over (due to age it appears), the walls are cold but not damp, however when touching this stuff it is nowhere near as cold as the wall thatís uncovered.
Be nice to know what this is. should i remove it all or just brush whatís loose then put over FOAMULAR (was going to use 0.5inch then 2inch studs and fill these).
What R value am i looking at hitting when doing the basement walls? The 0.5inch flat FOAMULAR is 2.5R then add other polystyrene between the studs
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