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starrider 02-18-2009 03:47 PM

what type of flat roof in coast home?
Hi Guys!

Still have been working on this old house for the last 5 years near the ocean. I need a new roof. Presently is some kind of silver foam that has harden and become brittle... and i am gaulking it every week ( the small cracks).

Most of these old flat style roof homes have the old pea gravel on tar.

I have contacted one contractor...that uses a membrane product that comes in rolls and is self adhesive. Have met with him...He explain he will strip the old stuff off and put two layers on going up the wall upcline 2 feet approx and over the four inches and re-reflash the edges. The product used is ...FLINTLASTIC SA CAP AND SA CAP FR.

He will have a sheet metal guy custom make new sky light window to replace the old ones that look rusted. Seems like a good company.

I guess the question is ...Is the old tar and pea gravel just as or are there other alternative style of roofing material for a flat roof. I am familiar with pitch roofs...but any input on flat roof would be appreciated....Thanks in advance....Starrider :) snow here...mostly a good rain in winter season and sea coast winds

johnk 02-19-2009 12:04 AM

There are many good flat roofing systems out there.Epdm,mod-bit,TPO,PVC and yes even foam.It is not so much the system as the installer."A Roof is only as good as it is Applied"

starrider 02-19-2009 05:07 AM

Thanks are correct...I am always concern about the people and quality of service they provide.

Those other roof types (you referred) i am not familiar with...i just looking for a good roof system that is bullet proof and will last a long time. Looking at the samples this contractor left...looks like it's made of some kind of rubber ...and the question of fire comes to mind...On a pitch roof...most common use are fiberglass composition shakes...which is more fire resistant...those kinds of questions come to mind.

And as you implied...the quality or craftmanship of the work is very important.

Thanks Starrider...:thumbup:

OldNBroken 02-19-2009 09:05 AM

The reason there are so many tar and gravel roofs around is because they are such a durable system. Cost is the only reason there aren't more done today. Membrane roofs are considerably cheaper but you get what you pay for, ten years vs 30 years.

Properly applied in proper weather, the SA he is refering you to is a very good system. Ask him if he is selling you the full 3-ply for it. Although I'm a diehard hot roofer, We have used flintlastic SA on many smaller jobs and have been very happy with the results. It is cleaner and considerably easier to install than a built up. I always insist on the full 3-ply system when I use it though. You should expect about half the life out of it vs tar and gravel but still better than a membrane and more durable.

Sounds like you trust he knows what he's doing. That is the biggest thing, especially in flat roofs. Like JohnK says, a roof is only as good as the person installing it.

Best of luck

AaronB 02-19-2009 10:00 AM

A foam roof should last indefinitely. Why are you having it removed? That is some EXCELLENT insulation. If you can provide pictures, I bet that you could perform minor maintenance, clean and coat that roof and get another 50 or 60 years out of it.

Save the money you will spend on tear off, re-insulating, and re-roofing if you can, and maintian that indefinitely-lifecycled roofing system. Polyurea is an excellent choice for long term foam preservation. Depending on the slope, I might even recommend an elastomeric acrylic coating, if conditions are suited.

starrider 02-19-2009 05:21 PM

OldNBrorken...THANKS!...i didn't know the old tar pea gravel...was still good...perhaps i will look for a few more contractors that do that style.

The present contractor said two layers of membrane was sufficient...and a elbow third strip that covers where the roof meets the wall to make it three layers he pointed out that is where most leaks occur. However if i go this way ...i told him i wanted three layers all

AronB...THANKS! ... I'm not real techy...and stopped taking pics when they when from celluloid film to digital...

Looking at the roof as it is looks like the previous owners just did a quick silver paint job on the roof. I don't know what it is ...right now it is caking up and cracking. In one spot i can see that they put a small mebrane patch and painted that silver too.

Like what was said in the beginning finding someone to do the job correct is priority...whether it be membrane...or tar and pea gravel.

The present contractor said he would replace the skylight frame windows...He has a metal guy that does this...what gauge steel should i insist on have this done?...Don't what to get anything that is paper

Thanks again guys any other advice welcomed...Starrider :thumbsup: :thumbup:

OldNBroken 02-19-2009 09:34 PM

Standard gauge for commercial sheet metal is 24ga with some requiring 22ga. In case you don't know, the higher the gauge the thinner the metal.

Flintlastic SA system has three layers. A nailable base, a mid-ply and a cap sheet. Yes, you can just use the base and cap for a decent system but, like I said before, I always recommend using the full 3-ply system.

starrider 02-19-2009 09:48 PM


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