Flashing On Roll Roofing

AHS

What is the proper way to install stacks when using roll roofing.

AaronB.

Is there one? LOL Really, roll roofing is nearly impossible to get watertight for any length of time, and I would have no idea how to do it with roll roofing alone.

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reveivl

The first rule is: "Never rely on tar to waterproof your roof"

The only way to waterproof penetrations in roll roofing is with tar. I wouldn't guarantee it for very long. Rich.

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Grumpy

Well I will start this post by saying I have heard quite a few times where roofing was called by the wrong name. Are you installing modified bitumen on a flat roof or are you installing 90 # mineral roll on a sloped roof?

It is my understanding that 90 mineral roll really shouldn't be used on sloped roofing, though it has been adapted for that function. 90 mineral roll is intended for use as a cap sheet in a hot tar built up roofing system. Using 90 mineral roll on a sloped roof is a sign of a true unprofessional in my opinion. I have been requested to do it a few times and every time I tell the customer "I can do it, but I can't give a waranty. I can do shingles for the same price and I can back my work for 10 years. Which would you prefer?"

Having said all that the very first roof I did was 90 mineral roll on a sloped roof. I worked for a total hack outfit. We tried to do a good job but it's very very hard with mineral roll.

Thunder1

You can increase the life expectancy of your tar seals on any type of roof with a 3-course application. If you ARE using a Modified Bitumen system then you should use tar or wetpatch designed for that purpose.

1) Apply a thin layer of tar/mastic/wetpatch 2" in both directions from edges of penetration. This first layer only needs to be thick enough to fill any voids and saturate the webbing in step two. Be sure to including any stray cuts in the roof membrane, mistakes with a sharp knife may be hard to spot and are sure to leak.

2) Apply fiberglass webbing to entire patch area, overlapping as needed. If you spread the first step at 2" in both directions then you should use a 4" wide roll of webbing. This is best attempted with a relatively clean 2" trowel to prevent the webbing from sticking to your tool instead of the patch. Be sure there are no air voids or loose ends, air bubbles and peeling are the most common failure with this type of application.

3) CAIRFULY spread a thick layer of tar/mastic/wetpatch over the patch area without displacing the webbing. This layer needs to completely cover the webbing as well as slope away from the penetration.

In addition to these steps you can optionally use colored granules to beautify the patch as well as provide some protection from the sun.

This patch system is designed to create two separate layers of material to prevent premature hardening of the under layer as well as stopping cracks in the top course from splitting all the way to the penetration base. I have installed and removed 3-course patches that functioned for many years with only minor maintainance

Note: I recommend that the tops of the flashing at pipes or other hardware be sealed with calking, counter flashing or any other easily maintained system.

I wrote this on the spur of the moment so if I forgot any key information let me know. It is also my first post so, hello to everyone.

"If you want a roof to leak, just build it flat"

AaronB.

Youre a steep slope person?

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Seamless Industrial and Commercial Roofing Systems, Residential Repair. For Those That Demand Quality!
Free roof inspections within 12 miles of our locale.

Thunder1

Generally speaking, yes. I prefer that any roof have gravity working for it, not against it. Unfortunately pitch isn't always practical so roofers occasionally have to earn their pay.


"Water flows down hill? What if there are no hills?"

AaronB.

FOr no hill/ dead level applications, Coal Tar pitch is the only warrantable system I know of.

__________________
http://www.roseroofing.net/
Seamless Industrial and Commercial Roofing Systems, Residential Repair. For Those That Demand Quality!
Free roof inspections within 12 miles of our locale.