Q:What are the roof insulation materials?

Polystyrene foam is divided into expansive EPS and continuous extrusion type XPS two: polystyrene board full name polystyrene foam board, also known as foam board or EPS board

Q:do I have to blow insulation in the roof of my mobile home if I install foam insulation under a meatle roof?

I don't think you can blow insulation in that area. It is to small of an area to get insulation into.

Q: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

Q:I am in the process of having a new roof installed. What are my options in regards to improving its' insulating properties?

No matter what material you use for the actual roofing, make sure you have a Radiant Barrier installed at the same time. There are several different ways this can be achieved, your roofing contractor can (and should) advise you on the best method for your home.

Q:i mean, what do you use to make it stay put? glue? nails?

These are sheets of foam cut to size, they use a piece or steel wire to hold the foam up its cut some what longer then the width of the bal so it bends forcing it to dig into the joist.

Q: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.

Q:I know when you inhale the insulation from the roof irritates the throat but what can you do to clear it from your throat after inhaling it?

it's not your throat you should be worried about. it's your lungs. wear a respirator....or at the very least, a dust mask. you only live once so make it last.

Q:I do not have extra space on the roof. Roof also tapers to drains at one end of building.

Nope. The DOW rigid insulation is an R-5/inch. So 4 inches gets you an R-20. Sorry.

Q:Why would you not insulate between the rafters in an attic? I see a lot of houses with no insulation on the inside of the roof.

A typical composite shingle would get too hot if you insulated the roof directly underneath it, decreasing life of shingle. You want good air flow in attic, insulate above the ceilings only.

Q:I have a split house with an attic where I have insulation on attic floor, but the house seems to be cold still, Can I add insulation to the roof of the attic? If so, any options? Thank you.

Most attics are vented, so I'm not sure how effective that would be.