[Greenbuilding] upgrading a 1959 1800 sf building in Montreal
molasses at q.com
Fri Apr 29 12:42:31 PDT 2011
#1 thing I would do? Blower door test and air sealing. Everything else
comes after. Not much point in insulating if you're leaking.
#2: dense-pack cellulose in an unvented ceiling assembly is not a good
idea without mechanical ventilation and might not be a good idea even
then, particularly if you don't have vapor-impermeable insulation in the
assembly next to the sheathing.
Stewart Abbey wrote:
> I recently purchased a 30'x60' building built in 1959. A 20x20 garage
> with a room above exposed on three sides. Crawl space with 2 floors
> and a flat roof. Exterior is brick in good shape. Tar and gravel
> roof was redone in 2008. Some windows have been changed, about 2/3rds
> are the the 1960,s screw-on aluminum guillotine type that leak like a
> sieve!! Oil fired hot water heat (with original cast iron boiler
> probably 60% efficient). One heating zone for each floor. Main floor
> has 3 apartments, 2nd floor has 2 41/2room apartments. Heating
> loops all pass though the crawl space. Walls are 2x4 construction and
> would have the standard of the day 3" of rockwool or fiberglass.
> Oil consumption was 5700 liters in 2010, and 5000 liters in 2011=$4500
> Last fall I had the crawlspace walls and rim joists blown with
> 21/2" of foam. Installed plastic on the crawlspace floor.
> The 2 second floor apartments will be empty next month. I'm
> thinking of blowing densepack cellulose into the 2x10 flat roof cavity
> from the inside through 3" holes in the gyproc. The current ceiling
> insulation is 3" rockwool or fiberglass. COST $5000+ plastering. The
> cost seems a lot but I know it is a slow job to do right. The
> contractor says 1 1/2 days per unit.
> We are probably getting gas on the street this summer and I am
> considering going to a 98% efficient
> gas condensing boiler. That alone should cut the heating bill by 50%.
> Gas is 93 cents per cubic meter.
> At the same time we would add zones so each unit would have it's own
> zone and thermostat.
> I am not planning on doing major renovations as the building is sound
> and well built.
> Anyone have advice on where to get the most bang for the buck?
> Stewart Abbey
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