» Re-roofing a porch

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  Post subject: Re: Re-roofing a porch
PostPosted: Fri May 24, 2013 9:43 am 
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A lot of overkill going on in the video. It's no where near that complicated. GAF is of course using the video to try and sell as many GAF products as possible. As Usual. That is their game.

Snakeo, the rolled roofing you are planning to use is a 5 yr. material. That tar in the 5 gallon buckets will be all over you from head to toe and it will probably get on the new roofing here and there as well.

Why not use this 20 yr. product that requires no nails and no tar?

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  Post subject: Re: Re-roofing a porch
PostPosted: Fri May 24, 2013 1:08 pm 
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Thanks for your opinion Islandroofing. I will def. take all the advise you guys have provided into consideration. I just bought the house 5 months ago and I'm not sure if that's the original roof or if it has been replaced since the house was built. Although I do agree with your assessment about replacing the entire roof, I'm not in a position currently to come up with 12k or whatever it will cost to have this job done. For now, I need to repair/prevent further damage as cost effectively as possible. Hurricane season will start in less than a month down here in South Florida, so who knows, maybe I'll get a new roof via homeowner's insurance. Thanks for the link, I will watch it and hopefully learn something. I will keep you guys posted.


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  Post subject: Re: Re-roofing a porch
PostPosted: Fri May 24, 2013 1:38 pm 
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So far I like everything the GAF self adhere system has to offer. I think this is prob the direction I'm going to go. Will continue reading about GAF's self adhere to learn more. LuckyChucky you mentioned that this particular roofing system comes with a 20yr warranty correct? I know most of these warranty are just advertisement, but If I can get 10-12 years out of it, I'll be satisfied.


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  Post subject: Re: Re-roofing a porch
PostPosted: Fri May 24, 2013 2:11 pm 
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Here is GAF's link
http://www.gaf.com/Roofing/Residential/ ... ne/Liberty

It says 15 yr. warranty on this link but I have a brochure from gaf that says 20 yrs.

The good news is the product is Miami and Dade County approved. Very hurricane resistant.

Also this material comes in most of the same colors as shingles or something very close.

Just another advantage it has over other systems as far as residential homes are concerned.

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  Post subject: Re: Re-roofing a porch
PostPosted: Fri May 24, 2013 2:49 pm 
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Unstick the shingles from one another ( with a flat bar ) and take out enough shingles ( by using a nail puller bar to remove the nails in the shingle you want to remove PLUS the nails in the shingle above that one ) to be able to remove all of the existing rolled roofing thats underneath them.

Then starting at the top and going down remove ALL of the existing roofing, drip edge and felt.

Replace any bad wood decking.

Check the whole roof deck 3-4 times to make sure NO nails are still present and sticking up.

Install new heavy weight felt. ( again watching for nails as you roll the felt out ) 15 lb is poor, 30 lb is ok , 44lb is great. base sheets are best.

Install new drip edge around the entire perimiter. ( prepainted aluminum looks nice and performs well ) 1 1/2 by 4 inch is best. 4 inches on the roof surface and 1 1/2 going down.

Measure and put an arrow shaped mark 38 1/2 inches from even with the bottom of the drip edge. ( if using gaf liberty as its 39 1/2 inches wide ) Then strike a chalk line for the bottom course only. This will give you a 1 inch overhang.

Starting at the bottom roll out the rubber roofing even with this line at the top. End to end if it will go that far, if not then as far as it will go. ( you can only roll it in one direction due to the seal lap strip at the top. )

You want to run it at least a foot up onto the shingle part of the roof.

Cut it to fit with a roofing hook blade placed in a regular utility knife.

Be sure the membrane is still on the chalked line. If so lift up one corner of the top and begin peeling the top half of the plastic backing off. Peel it about 6 feet and go back and stick down ( with your foot ) about one foot of the very top corner where you first raised it up. Then get out in front of the part where the plastic is coming off and pull the rest of it off all the way across in a diagonal motion. ( in other words the membrane is straight horizontally and you are standing just up above it pulling the plastic off at a 45 degree angle. NOT STRAIGHT UP. )

Stick that part down good by using a weighted roller or just walk it if you don't have one or don't want to buy one.

Flip the bottom half over and up so you can now peel the backing off of that at the same 45 degree angle.

Use the overlap strip and roll all the remaining pieces with the bottom of the roll even with the bottom of the overlap strip.

Word of Caution: Keep the rolls in the shade as they are very difficult to deal with if they get hot.

Also make sure the material lays smooth. If during the process you ever see a wrinkle in the membrane you need to stop immediately and straighten that up before continuing.

When you get to the valley, cut a small piece and slide it up under the shingles as far as you can get it to go and remove the bottom half of the backing only and stick it down over the new membrane.

Replace all the shingles you had to remove to be able to transition the membrane from the low slope roof up at least a foot onto the main roof slope ( the shingled slope )

Measure one inch at the bottom and top of any rake edges, chalk a line and cut down the line with the hook blade utility knife.

Woo Lah! You gotz a new low slope roof!

Good Luck!

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  Post subject: Re: Re-roofing a porch
PostPosted: Fri May 24, 2013 3:12 pm 
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Snake, whatever you do. Don't use that Home Depot crap you showed in the picture! You showed 30lb. paper, 90lb. mineral surfaced, & Gardner adhesive. Go to ABC Supply. If you go that way go with a 72lb. base sheet, Karnak#19 summer grade, & then your 90lb. cap sheet. Don't forget your 3''x3'' edge metal either.


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  Post subject: Re: Re-roofing a porch
PostPosted: Fri May 24, 2013 3:34 pm 
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@LuckyChucky

Thank you!!! very much for the great detailed "how to" you provided. I'm going to print it and go over it carefully to make sure I understand every step. Turns out none of the big box stores (homedepot, lowe's) carry the Liberty self adhere roof system. Luckily we have a few ABC Supply stores around town and I'm calling now to check prices. If I have more questions, I will def. post back. Thanks for all your help thus far.


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  Post subject: Re: Re-roofing a porch
PostPosted: Fri May 24, 2013 3:40 pm 
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Whatever material the h.o. or his contractor uses they can run the field sheet up a few courses & then slip a 1 way counter flashing up under the shingles without disturbing them.


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  Post subject: Re: Re-roofing a porch
PostPosted: Fri May 24, 2013 6:18 pm 
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@LuckyChucky,

Called ABC Supply, and they only have Liberty Cap Sheet. Salesperson explained that most stores instead carry Polyglass self adhesive roof system, and thus they only stock the liberty cap sheet and not the base or base ply. For now, let me stick with GAF....if I read and understood your instructions correctly:

"
Install new heavy weight felt. ( again watching for nails as you roll the felt out ) 15 lb is poor, 30 lb is ok , 44lb is great. base sheets are best."

you recommend that instead of using GAF "Liberty base sheet" & "Liberty Ply sheet" I go with a good 44lb base felt and then apply the Liberty cap sheet over it?. Just want to make sure I read it correctly? If so, do you recommend any particular brand for the 44lb felt?


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  Post subject: Re: Re-roofing a porch
PostPosted: Fri May 24, 2013 9:00 pm 
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I have kind of been following along and do not know anything about the GAF Liberty described. I do not even understand what, or why various "base sheets" are recommended beyond the twin (GAF) version of the cap sheet.
I have and will continue to use Certainteed Flinlastic 2 ply system (base and cap)on these sort of projects.

Tear off existing and ensure the deck is in good shape and repair as necessary.
Prime entire roof deck with primer and allow to "tack up" (your supplier should have what is necessary).
Apply Flintlastic base sheet with 1" overhang on all eaves.
Apply all perimeter flashings (drip on bottom eave and gravel stop on gables) compressing overhung base sheet over edge.
Apply Flintlastic cap sheet with off-set to the head lap of base sheet. I also run bead of mastic or APOC on all peimetre flashing to stop water from backing up under cap.( be sure the product you use is compatible with peel and stick) Nip (2"x2" {so water doesn't trail along top edge}) all top edges on cap sheet on all top edges ( on flashing or where laps are necessary {hopefully can be avoided})
When applying cap sheet, allow a slight over hang and then cut back flush with perimeter flashing.

Premeasure and cut all membrances and allow to warm in sunlight to help with it laying down properly. DO NOT ALLOW TO GET TOO WARM as this will cause it's own problems.

Always loose lay membranes in correct position before removing backing and then take our the lower backing and stick, then the upper and stick.


I would strongly suggest this be a two man operation.

not great at expressing instructions in writing, would rather show you ( or install but not possible) but hopefully you get the idea.

I believe you should be able to Google search the exact instructions if unfamiliar with proper installation.

Just saying, this is the system I trust with our slightly sloped ( low slope) applications and have no issues whatsoever.

pic is off internet to give you an idea of finished look

johne5


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  Post subject: Re: Re-roofing a porch
PostPosted: Fri May 24, 2013 11:12 pm 
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Snakeo2: That's what it is called GAF Liberty Cap Sheet! Call them back and make sure its "self adhered" with a plastic backing and has " a shingle grain surface ". If so that is the correct product. Should cost around a hundred bucks a roll including tax. ( Select the color based on what color shinlge you will roof the house with later )

To get the maximum warranty ( 20 yrs ) you have to use all GAF stuff. That's how they roll!

However on a sloped roof with no ponding water the underlayment becomes somewhat less important. Even with this being said I still suggest 44lb felt or better. 44 lb felt is marked by a yellow line. Usually in the center.

Your job is ideal for this product. I do not recommend installing it on a totally flat roof however. Especially with ponding water. It works great on a 1, 2 or 3 and 12 slope. Yours is somewhere between a 1 and 2.

Johnny5 also installs a good low slope system and he gives very sound advice when suggesting you have at least one helper up there with ya. 3 people total would be ideal for a novice. One on each end and one in the middle when getting ready to peel the backing off.

The 3 of yas can gently flip the top half of the membrane down, peel off the backing and then gently and slowly let it rest back in its place. Then flip the bottom half up. Etc. etc.

Bob s also has a good point about the places where the membrane will tie in to the shingle roof. But you need to be sure all the old rolled roofing is not left up under the shingles because that could cause a hump right around where they tie together which could cause a leak. As long as everything is laying flat and smooth its all good.

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  Post subject: Re: Re-roofing a porch
PostPosted: Sat May 25, 2013 1:19 pm 
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Ya Snake. I agree w/ Chucky. U want S/A, self adhered. U don't want to be messing w/primers.


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  Post subject: Re: Re-roofing a porch
PostPosted: Sun May 26, 2013 4:47 pm 
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Thanks to everyone for their contributions. Since ABC Supply did not have GAF Liberty Cap sheet in stock, my project has been delayed. I'm going to follow up with them next week and order the materials I need and hopefully make preparations for the 4th of July weekend. I'm glad I found this great forum and thankful to all you professionals that took time to answer my questions and educate me along the way. I will keep you guys posted.


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  Post subject: Re: Re-roofing a porch
PostPosted: Mon May 27, 2013 2:38 am 
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We couldn't have done it without ya Snakeo!

Good note: Rolled roofing is pretty easy to tear off a roof.

Bad note: A roll of self adhered membrane is quite a load to handle, especially vertically.

You have certainly made some good decisions and I hope everything works out well.

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  Post subject: Re: Re-roofing a porch
PostPosted: Mon May 27, 2013 10:18 am 
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Looks like about 6 rolls of rubber will do it snakeo.

You will also need 3 bundles of Gaf Timberline 30yr. shingles.

3 rolls of 44lb felt and 60-70 feet of drip edge. ( 6 or 7 pieces )

One small box of 1 inch felt nails.

Weathered grey/Weathered wood ( same thing ) is your existing roof color.

The Liberty Cap Sheet is available in that color.

Total cost should be around $900.

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