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Country Discussion Topics
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Question about porch
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Hello deadcarp-    Posted 02-01-2004 at 05:53:39       [Reply]  [No Email]
I saw that you posted the temperature difference in your glassed in porch. 30 degree difference between the enclosure and the outside temp.? Does the porch have a cement deck by any chance?

This stairwell enclosure I'm working on has a canvas paint drop covering the south wall. The north wall just has a 3/4" plywood skin so far.
It is getting about 30 degrees difference. Must be some decent heat transfer through the tarp.

Did you insulate the outside of the exterior wall of your house when you enclosed the porch?




deadcarp    Posted 02-01-2004 at 08:22:13       [Reply]  [No Email]
truth is i don't have the walls really done yet - still have 1 with split logs over tarpaper. then it has a cement slab floor, sits up a couple feet and banked snow but no insulation outside that yet. i'm insulating the walls but no foam sheets or anything over the framing. when it's done a cross section will have split logs, tarpaper, insulation/framing, tytvek and barn boards. there's no real drafts or leaks to speak of, little one around the cat door, but the walls are about half glass and boy that sucks heat. i gotta improve those windows.

you know when you think about it, tarp is a pretty good stabilizer for heat transfer - think about tents, fish-houses, greenhouses. actually pole barns absorb sunlight real nice but kinda lack thermal mass to store it. i've been thinking about doing a little wall test by making a couple of matching foam boxes (little rooms) use one for a standard and one for tests, set both up with inside thermometers and just set them out by each other and see for myself what happens to the sunlight and heat. might test a solid box against small single glass window (plexiglass probably), single glass with a plastic liner, double glass, reshape the thing for a glass wall, add cement blocks inside etc. maybe i'll try some tarp on the sunny side - good idea. :) i'm sure schools and labs have tested such things to death but not in my yard where i could watch them.


cross section QT    Posted 02-01-2004 at 10:31:19       [Reply]  [No Email]
Did you plan to use a 'trapped air' pocket in your cross section? It has been my understanding that trapped air is the best insulation you can utilize. Been hearing that as long as I've been in the trades. Never had the oppurtunity to try it myself until now. The pocket I'm going to use is 2" deep. Sealed in polyurethane siding caulk. Then 2" of foil covered foam. I don't know how well it will work. It will be the North wall only, and directly above the stairwell block wall. The East side is the door side. The South is the window side. This is a small space, but it should get enough heat to allow the lower door to stay open. The basement stays around 62 degrees nearly all winter. Our winters here in Virgina are nothing like yours up in Minnesota, although it has been sort of cold here lately.


BOSS    Posted 02-01-2004 at 12:18:03       [Reply]  [No Email]
Dead air is warm air. Don't let that air vent anywhere, or it will be cold air.


deadcarp    Posted 02-01-2004 at 11:15:13       [Reply]  [No Email]
well the whole idea of insulation is to trap air but then the air has to be kept from drifting around or it carries heat again. for example you take a thermos bottle vacuum tube and it insulates alright because there's precious few air molecules in that vacuum. if you packed that vacuum tube with say glass wool, it would insulate even better. if you used squirt foam it would be better yet. similarly bubble wrap traps air in little pockets but each pocket still circulates and moves heat from one surface to the other. foam has tinier air pockets yet so the heat has to cross several of them to get thru. yup trap air, yup seal out any drafts, but i'd also install something fluffy in the compartment. :)


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