<br><br><div class="gmail_quote">On Fri, Apr 29, 2011 at 3:42 PM, Kat <span dir="ltr"><<a href="mailto:molasses@q.com">molasses@q.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
#1 thing I would do? Blower door test and air sealing. Everything else comes after. Not much point in insulating if you're leaking.<br>
<br>
#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.<br>
</blockquote><div>Not to mention if the roof frame can take the additional snow loading. We had a public works barn ceiling collapse after having cellulose blown into the walls and attic. We were lucky no one was hurt and no fire started.</div>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<br>
-Kat<br>
<br>
Stewart Abbey wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div></div><div class="h5">
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.<br>
Oil consumption was 5700 liters in 2010, and 5000 liters in 2011=$4500<br>
<br>
Last fall I had the crawlspace walls and rim joists blown with 21/2" of foam. Installed plastic on the crawlspace floor.<br>
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<br>
gas condensing boiler. That alone should cut the heating bill by 50%. Gas is 93 cents per cubic meter.<br>
At the same time we would add zones so each unit would have it's own zone and thermostat.<br>
I am not planning on doing major renovations as the building is sound and well built.<br>
<br>
Anyone have advice on where to get the most bang for the buck?<br>
Stewart Abbey<br>
<br>
<br>
<br></div></div>
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