Low slope porch roof
#1
03-15-04, 05:42 AM
Low slope porch roof
Hi everyone,
I'll try to make this short and succint.
I have a low slope (prolly 1/12- 2/12 at the most) porch roof. There is only a very small section about 7'X10' that is actually right over the interior of the house.
The roofer came and said to use "halflap". Soo, I went to the Home store and found what I think is it. They called it "selvage" It looked like thick tar paper #' wide, with granules on 1/2 of it.
So, my questions are:
Is this the right stuff?
Do I also put down #30 felt paper beneath it?
What about Ice and Water shield instead of felt paper, over the entire porch roof? ( I live in Vermont, so lots of snow and cold)
When I put down the "halflap" do i use roofing nails, or some sort of tar or what?
Thanks,
Kevin
I'll try to make this short and succint.
I have a low slope (prolly 1/12- 2/12 at the most) porch roof. There is only a very small section about 7'X10' that is actually right over the interior of the house.
The roofer came and said to use "halflap". Soo, I went to the Home store and found what I think is it. They called it "selvage" It looked like thick tar paper #' wide, with granules on 1/2 of it.
So, my questions are:
Is this the right stuff?
Do I also put down #30 felt paper beneath it?
What about Ice and Water shield instead of felt paper, over the entire porch roof? ( I live in Vermont, so lots of snow and cold)
When I put down the "halflap" do i use roofing nails, or some sort of tar or what?
Thanks,
Kevin
#2
03-17-04, 12:12 PM
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hate to ask but did you also say you didnt want to spend much money on this or something similar?there are lots better roofs to be had for that purpose but depends on how much cash you think its worth.selvedge does work for about 3-5 yrs but like i said.for that matter a blue tarp will last around a year.lol
#5
03-20-04, 07:15 AM
I had thought about full coverage of ice and water and then shingles, but I am hearing that shingles are not good on a low slope roof. The snow and ice can work back up under them.
I have no idea which is better. I would love to put shingles on and it is a porch so there is no heat going up to it from inside the house. (to cause ice dams).
Anyone have advice on which is most suitable??
I have no idea which is better. I would love to put shingles on and it is a porch so there is no heat going up to it from inside the house. (to cause ice dams).
Anyone have advice on which is most suitable??
#6
03-20-04, 12:26 PM
For cost Id go with the halflap. put down the 30 lb paper . Then cold mop the halflap down nails 12 on center on th clear half ,then cold mop the next halflap the same. you only have 70 sq ft there.
ED
ED
#8
03-23-04, 06:51 AM
If you go full coverage Ice & Water Shield, the roof will be waterproof. Yes, the shingle mfr will not warrant below 3:12 slope. This is due to granule degregation (sp?). The granules wont last as long. Ice moving on such a low slope wears out the granules. This usually happens in valleys. If you can live with this, do it. My 2:12 porch roof was done this way 12 years ago with 25 year laminates. It is a non-heated roof (in a ski area) and gets lots of snow, but little ice buildup.
Only my opinion.
Jim
Only my opinion.
Jim
#9
03-24-04, 11:37 AM
Sounds good to me, costs a little more but lasts a lot longer. I'm all for that. The other thing I heard was to put some roofing "tar" under each flap on the shingles to help hold them down also.
I have to fix the porch first, but then I am up to the roof.
Thanks
I have to fix the porch first, but then I am up to the roof.
Thanks
#10
03-28-04, 04:21 PM
Porch Roof
Hello, I'm also in VT and have an unheated porch under the main roof eaves. I had nothing but trouble with what I think you're calling half lap. I heard it called double coverage. In its defense, I don't think the builder installed it correctly, no tar paper beneath and no tarring in. After many hours swabbing tar on the seams trying unsuccessfully to cure leaking problems I removed the whole thing and installed a product called MSR-100. It is a very soft granular roofing that comes in rolls like the double coverage and has a sticky underside protected by a plastic layer you strip off as you roll it down, and it sicks to the layer beneath. To prep the roof deck which was tongue and groove lumber, I had to first lay down 3/8 CDX and cover the jounts with drywall tape. I put drip edges on eaves and rakes. Then follow directions closely for installation. The stuff is fussy to put down but after the lousy material I had there before I was ready to spend some time up front for something that wouldn't leak. When the roof heats up the material reseals itelf against nails, underlayers, deck, etc. You have to avoid walking on it on hot days when the sun is on it because your shoe will smear the granular surface, which softens under the heat. The installation is around 5 years old and hasn't given me any trouble and I would recommend it. Good luck!
#11
03-29-04, 09:25 AM
Thats good to know. I will have to look fro that at the local home depot. Still not sure to go that way or with the ice and water and then the shingles, with lots if tar under each flap. Where in VT are you. Would love to talk more and compare notes.
cya,
K
cya,
K
