Maths GCSE past paper question about density?
I wouldn't do cellulose in anything but the ceiling as it falls in walls and is uselessUnfortunately you don't have a lot of options for insulation if its already drywalledAny barrier that disrupts temperature transference is going to help so I would think the expandable spray in foam has to have some valueRarely does any advertised R-value actually add up to what it is advertised at, unless it was hotbox tested.
Here's how the best vapor barriers are installedThis is done on ALL walls and ceilingsThe point is to create an airtight sealJust stapling on 3 mill plastic over bats before you drywall doesn't do the job Correct way: 1Insulation 26 mill Fire rated vapor barrier 3Red sealant tape to join them together 4Special caulking sealant for corners and nooks 5Install Furring strips 6Install drywall Now BASF spray foam insulation does not need a vapor barrierSince you already have drywall installed all those steps above can't be doneThe best way is to use the BASF walltite Eco extruded purple polyvinyl foam insulation and then blow in on top of thatAsk the opinion or research Canadian contractors and builders since you're up that wayThere are installers who have foam master certificationThey usually know insulation much better than American onesI noticed the comments here and was shocked by the ignoranceFoam insulation is the best insulationHowever, it majorly complicates any repair work or additions (running wire for a new circuit) where it's sprayed.
Purple Spray Foam Insulation
density mass/volume Nickel density 8800 20/volume (Ni) Aluminium density 2700 20/volume (Al) volume (Ni) 20/8800 Volume (Al) 20/2700 difference density 20(1/8800 – 1/2700) 20(8800 – 2700)/8800 × 2700 20 × 6100/8800 × 2700 61/44 × 270 0.00513 m? -
