INSULATION INSULATION TO MOISTURE BARRIER RSI “U”
value is the coefficient given to rate of
heat transmission it is measured in watts divided by heat
differentiation through a materials thickness times the square metres
of the material the lower the U value the better the insulation -”RSI”
values are the reciprocal of U values
RSI = 1/U the higher the number the better the insulation -Degree
days are days where the temperature is
below 18°C you take the number of °‘s
under 18°and multiply by the number of days where the
temperature was below 18°
the answer gives you the # degree days you take this number to the
insulation charts for the required insulation “RSI” -heat
loss occurs: air infiltration, doors,
windows, basements, walls ceilings, basements high moisture content in
soil, high water table under slab, SLAB VAPOUR BARRIER WITH PERIMETER EXTRUDED POLYSTYRENE -
interior concrete foundation wall must have a
moisture barrier (polyethylene 6mil or 2 layers bitumen) if a non
plastic insulation is used, below grade (note the above grade portion
of the concrete wall should not be vapour proofed on either inside or
outside to allow trapped moisture to escape) on concrete side of the
insulation batts, plastic type insulation’s should be grouted or bonded
to the concrete with a synthetic adhesive, adhesive should form a grid
pattern, all plastic insulation must be covered due to fire spread types -fibreglass batts use a friction fit between supports (studs, joists, use r20 in 6" walls and r40 roofes -blown insulation fibreglass or cellulose... benefit in roof areas covers truss members -Interior
to insulation 6mil poly to provide air barrier and vapour barrier...
seams sealed with tape and/or acoustical caulk -rigid
fibreglass insulation,
water permeable
can be used for: exterior sheathing (but wracking support must be
added), can be used exterior foundation walls (should be protected) -extruded
polystyrene foam insulation can be
used as exterior sheathing ( in lou of plywood) nailing: edge 150 field
300 head size 11 / 38 into wood “RSI is .87 per 25
mm -expanded polystyrene white board on concrete wall at grade level
EXHAUST FAN INSTALLATION IN CEILING Ensure
drywall has enough screws to compress foam gasket
-backing rod compressed into spaces around windows and doors and then caulked (the best air seal possible)
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