Mendocino/Fort Bragg
707.964.8735

 

Ukiah
707.462.7506

 

contactus@dunlaproofing.com

Flat (or low-slope) Roofs - Post 2004

The days of hot tar and flamethrowers are rapidly coming to an end. The insurance companies are getting more and more restrictive in what they will allow us to do and I don't blame them. It really doesn't break my heart to lay those dangerous systems to rest and move on to safer and more intelligent forms of roofing. I've decided to offer two different (although similiar) single ply, hot air welded roofing products. The first is Carlisle TPO and the second is Duro-Last. The primary difference between the two is the chemical make up of either one. TPO stands for "thermoplastic polyolefin". The Duro-Last product is a "polyvinylchloride", or PVC. If you know a chemist have him explain the difference between the two because I sure can't. Both companies offer outstanding contractor support and stand behind their product. It's good to have both available as they each excel in different applications. So now we will move on to pictures and descriptions of them now starting with the Carlisle TPO.

Click any image to view the entire "story" one page at a time, but with larger versions of the images - slide show style..

1st EXAMPLE: CARLISLE TPO  •  2nd EXAMPLE: DURO-LAST

 

FIRST EXAMPLE: CARLISLE TPO

For new construction we start with one layer of plain old 30lb. roofing felt, used as a pad sheet.

For smooth surfaced re-roofing we use the same 30# felt, again as a pad for the new roof. For rough surfaces we start with a product called "fan-fold", which is a 3/8'' foam board that provides more protection from the rougher surface. You can see it in the Duro-Last topic discussion in this catagory.

After the base sheet is installed the 6' wide rolls of TPO are rolled out.

And attatched with screws and plates.

Then the welding begins with special hot air guns and neoprene rollers. This has to be done correctly to get a good weld.

The TPO is turned up skylight curbs and the corners re-inforced with special flashing material to insure a good seal. This eliminates the need for any metal work can could rust out prematurely.

We then install the TPO over the parapet walls to complete the seal all the way to the exterior of the roof.

And then finish it with 1"x4" lumber or whatever finish is desired.

The plumbing vents and pipes are all finished with factory provided flashings as needed.

Here is the finished roof, complete and water proof for many, many years to come.

 

SECOND EXAMPLE: DURO-LAST

Here we go. We are going to replace this old tar and gravel roof with a state of the art Duro-Last roof. But the first step is to remove the old roof first.

What a mess! Don't try this at home, we are professionals. This actually took my crew one day to strip and clean it up. But we do this all the time and we have the right tools and experiance to make it go quickly.

After the surface is prepped the first step is to install the "fan fold underlayment board". This goes real fast as the board just unfolds and is quickly attatched with screws and plates.

The Duro-Last roof is comprized of a series of made to order panels that are pre-welded at the Duro-Last factory. This keeps on site lap welding reduced to a minimum. The rolled panel is rolled out on pre-determined chalk line and the installation begins. These panels will be stretched tight and then secured in place with screws through hold down plates.

Here you see the panel stretched and screwed along two lines. Every black circle you see is a fastener. This roof will NOT blow off! Notice the knee puller on the left, you see it in action soon.

Nearly every roof has plumbing vents, skylights, etc. This is no problem for Duro-Last. First just cut around the pipe . . .

Then weld on the factory provided flashing.

Here is the hot air gun and roller used to weld seams. This is an exacting process that needs to be done correctly to insure a quality job.

At this point all six primary panels are in place and screwed down. The installation of these panels took one day.

In this shot you see the knee puller at work. It pulls the membrane tight to make for a smooth and tight roof. We also have a larger puller used to pull the full panels tight.

Yuck! Old skylight curbs, very stinky.

Yea! New skylight curbs with the Duro-Last being installed.

What a difference! That looks and works much better.

This is a typical drain. All drains, skylight saddles, vent pipe flashings, etc. are all made at the factory to make our job easier and better.

The roof vent is a neat feature of Duro-Last roof systems. This vent not only allows residual and internal home generated moisture to escape out from under the roof but when high winds are occuring it creates a vacuum under the roof which sucks the roof down even tighter. This is easily one of the most wind proof roofing systems available.

The finished Duro-Last roof. The Duro-Last company offers one of the best warranties available and has extensive support for the roofing contractor and property owner. Please contact us to find out more and get your own "Duro-Last" roof.

return to the top