I just had a 28' x 40' pole barn built with a gambrel roof. I want to
insulate it and contacted a guy that does closed-cell spray on insulation. I
was floored by the cost of it. What are my options as far as insulating it
goes? It is not "framed in" on the inside.
Thanks for any help you might have.
Prices for that sort of thing have gone way up. You could use sheets of
either extruded or expanded polystyrene sheets. It should be covered with
sheetrock to meet building codes. You want at least 2" so, to do the walls
you need over 2000 board feet of material for the walls. For the best
price, look for a foam fabricator rather than pay retail at a building
supply or home center. If you are in New England I can point you to a
couple of them.
For foam you do get what you pay for, higher R per inch, no air
infiltration, no settling, no low temp or air degradation . Look at
utility savings not just the cost, its like buying a Hummer and then
bitching about gas, short sighted.
Just poles and purlins? How about 1" "R6.8" double-foil polyiso board?
Around Phila, 4'x8' sheets cost about $16. With air gaps, the foils add
about R3 to each side. You might glue square 1x3 spacers to the back with
gobs of spray foam from a can, let that harden, then stick the board to
the inside of the metal siding with more spray foam and foil-tape the seams.
For more cheapth, you might screw 2"x4" welded-wire fence to the inside of
the poles with 1x3 cap strips and fill the 6" space between the fence and
the siding with plastic bags containing dry leaves.
Then add Gary Reysa's $350 160 ft^2 solar barn heater, described at
http://BuildItSolar.com and in the Oct/Nov issue of Homepower magazine.
You maybe store solar heat in thermal mass under a foil ceiling.
Dried leaves, ha, ha funny, boy. I'm cheap, but not that cheap. I'm just
looking for something less expensive than the $7500. I was quoted for the
closed cell spray on insulation I was looking into.
Dried leaves, where am I supposed to get them, it's wetter'n hell here.
Funny you should mention this stuff. I just put three sheets of it on the
inside of my garage door. Just cut to fit into the panels and used
'construction adhesive' to attache the un-foiled side to the inside metal of
the door panels. Figure between the foam and foil, should help keep the
garage warmer. Don't deliberately heat it often, but with two car's worth
of engine heat, it used to melt the snow off the car windows by morning most
days. Hope with this foam (before was just uninsulated tin door), and the
adjustments I made to reduce the draft around the door, it will be warmer
$15.97 at Lowes for 4x8 1" polyisosomethingorother. While one side is metal
foil, the other is just 'sealed' with a plastic material.
Home Depot and Lowes sell foil-1-side, but you can get it with 2 foils
for about the same price from building supply places and save more heat
that way if 2 airspaces are possible. One double-foil brand is Atlas
Energy-Shield roof insulation.
I've been pretty happy with my purchase of rFoil from
They have a large selection of Foil/Bubble/Foil and Foil/Double
Bubble/Foil, as well as Concrete Barrier foil if you are doing Radiant
In Floor heating under a concrete slab, which is what I did.
I have a 23 x 40 pole barn and I cant decide on either spray foam or the
Foil types. I also see several insulation foil types on ebay. I have heard
about the cost of spray foam type insulation, and about the fire risk from
both. I just want a cheap easy fix like the rest of you. I cant use the
dried leaves either. it was a thought. lol I am really thinking about a
radiant barrier, double foil faced with I believe it is a black mesh that
is supposed to prevent the dust etc from degrading the foil reflection. I
was told that I could install it underneath the truss.(so about 3 1/2 "
from the metal roof and this would help against condensation also. I am
not a carpenter by any means. staples? I could handle that. I guess that
you would then also have to use the aluminum tape to seal the gaps? Would
you vent this air gap on the top or sides of the end of the roof or would
it just be a sealed pocket? just alot of questions and I didnt know what
type is better. Thanks Ron
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