Charcoal On Aluminum Foil

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FAQ

Rather than waste that heat on sunny days during the heating season, can it be used to help heat the home? Otherwise it would just passively be vented out. Has anyone done this? Is it a good idea or not?

Not very practical. You would, in essence, draw the heat out of the space (rooms) below. Insulation in your attic does allow some heat to pass through.

on a traditional pitched roof construction,where is heat insulation usually provided?

Generally, the insulation is blown in loose fiberglass to around 14 inches -- R 38, between the ceiling joists. Radiant barrier roof decking is often used in conjunction with this method, along with excellent attic ventilation to allow heat to escape. Sometimes, with foam insulation in new construction, the foam is installed between rafters, to create air conditioned attic. This is much more expensive, but if done right, can result in greatly lowered energy consumption. This method requires outside air having a way to get into the home, requires special AC and heat equipment, and if the wall insulation and window package aren't up to snuff, much of the effect is lost, resulting in wasted money -- tens of thousands of dollars, literally.

does insulation, with a high R value, in the attic prolong the life of the shingles on the roof.

I don't get the connection between R-Value (insulation) and shingles that are exposed to the outside!

Sorry, I asked this in the maintenance and repair section, but no luck.Which is better to have in a 2-story home? My last 2-story home was always hotter upstairs than down. (Physics...heat rises)

the best is more attic isolation so that the heat don't come directly to second floor.

I know you're not supposed to directly insulate the roof due to the roof getting super heated in the summer, but my walk-in (actually, more like "crawl in") attic is very hot in the summer and very cold in the winter. Is there anything I can do to improve efficiency? I can't help but think I'm wasting a lot of energy just to keep my roof lasting a little longer.

You can avoid the condensation problem by simply leaving a minimum 2'' gap between the roof and the insulation. You need to fix battens on to the rafters ( at least 2'' from the tiles ) and then fix blanket or rigid insulation tight between them. The battens will maintain the air space. You then need to fix a vapour barrier over the whole thing and finish with plasterboard. No small job to do it properly ! ps you need to check the condition of the roof before you start and fix any loose tiles etc Alternatively, turn the heating up and wear a thicker sweater.

hot because of all the added insulation. Is that what the insulation will do? Someone told me that it will save us on our cooling/heating bills, and that it will be warmer in the winter and cooler in the summer now. Is this true?

Insulation stops heat from being transferred across it. Therefore, if it's cold outside and warm inside, it will stay warm inside because the heat can't get out. Likewise, if it's hot outside and cool inside, the heat can't get in so it stays cool inside. The exact same principles are used in vacuum flasks that keep coffee or soup hot. If you put cold drinks in there, they will stay cold instead, even on a hot day. The principle used in both cases is to stop heat from being able to travel to or from the inside to the outside. In a vacuum flask, they achieve this by using a double walled flask and sucking out all the air (leaving a vacuum). In a house however, it's not practical to do this (except for windows which is how double glazing works) so they use some sort of substance that traps large amounts of air in it (like fibreglass or polyester batts) to achieve the same effect. Hope this helps. TV

I live in the top most floor of a flat. Is it worth to insulate the roof (from inside) with styrofoam(thermocole) to reduce the airconditioning load. Is it really economical with respect to cost of insulation and savings gained? Any experiences?

if u mean roof as just below the shingles this is not recommended as it will cause the shingles to become very hot and prematurely fail,,the best way to lower the heat in an attic is ventilation,,if u have an attic its best to insulate the floor of the attic and lots of ventilation

attic is 400 sq ft.there are 4 round 6'' Vents in soffit,and 2 roof vents-12"x12".Rock wool,blown in,R/30 NO VAPOR BARRIER.Why the mold?no gable or ridge vent either.How do i fix this?There are baffles in attic,rafters are not blocked.

is your HVAV unit in the attic?Is the moisture coming from it? Also-ridge vents help allow proper ventilation.