Flat roof types for small extensions?

Answer 1

you would be far better off if you put a pitched roof on.less problems in the long run, not much dearer than a flat roof

Answer 2

You can tell who knows about roofing by reading the answers here. In Florida, many older homes have a low 3 or 4/12 roof pitch with a flat section on the back of the house covered in an SBS Cap sheet. Assuming you don't have a large snow load to contend with, you should be fine using an EPDM vinyl/rubber system, you might want to consider the use of tapered insulation below the roof surface just above the decking to maximize the "R" value. Shingles obviously are not the way to go here... either a self adhesive system or mop down application are the most common roofs that I see at work.

Hope this helps and when in doubt, contact a professional.... a little extra money now sometimes means huge savings later.

Answer 3

As everyone else is saying, a sloping roof is going to need less maintenance than a completely flat roof. You can use sterling board for the roof deck itself - sometimes called oriented strand board, supported on timber purlins. Then waterproof with roofing felt or better still EDPM rubber sheeting. Make sure you have a good seal between the existing house and the extension and the joint is covered with flashing to prevent leakage.

Answer 4

Flat roofs are OK but do not put in in completely flat use a minimum fall of 1 in 80 (building regulation standard) 1 in 40 is better as you want get any ponding( that is when the water stops on the roof in a pool)
If the roof is over a habitable room go for a warm deck roof with 13mm white stone chippings embedded in bitumen on three layers of roofing felt on celotex warm flat roof tempcheck board on firrings laid to fall minimum 1 in 80 on softwood roof joists at 400mm c/c with 12.5mm plasterboard and skim
check out Celotex insulation site

Answer 5

Yes, you can put a flat roof without leaks easily by using a .060 or .045 rubber sheat glued right down with contact adhesive to the plywood below. Firestone makes this material and it is cut to length from standard widths of 6, 10, `12, 15 and 20 feet and is available at any good roofing supply house cheaper than even regular asphalt roll would be. And it will last for like 50 years guaranteed by Firestone.

Answer 6

I wouldn't use a flat roof for any part of the roof. There is too much upkeep on them what with rain and snow just sitting on the room. If you chose to put in a medium slope, I would suggest using duro-last. I am quite happy with it.

Answer 7

flat rooves do need upkeep much more than a pitched roof but if you are definately having a flat roof or are re roofing existing i would have a fibreglass surface applied over new wpb ply boards. never heard of rubber sheets so cant comment.

Answer 8

i'd decide for a single membrane style roof (Sarnafil) laid over insulated decking. (inspect their internet site for thoughts) because it relatively is a clean extension that's going to ought to regulate to present day development policies with connection with U values.

Answer 9

if you are going to put a shallow roof on i would suggest a torch down. overall though i would put as much pitch as possible.

Answer 10

Unless you live in death valley, with little , or no rainfall, I recommend a pitch on any addition. If you have snow load to deal with, you need a steeper pitch.