Flat Roof Installation -Torch Down Rubber Roof Membrane

Flat Roof Installation -Torch Down Rubber Roof Membrane

by Naas Ferreira | Jul 20, 2012

Flat roof Installation over a garage roof. Whether it be a residential or commercial building, the materials we use are the same. The big problem with residential roofs is the posts, siding and vent flashing.

In the roof video, you will see a door sill that was a problem. When re-roofing, the common problem with residential roofs is the siding and the railing posts. Most of the time we have to make roof repairs around the posts and other objects before installing a new rubber roof.

In most cases if possible, it is better to remove the railing. That gives better access to the edge of the roof to install the drip edge.

Whether we do a small roof over a garage or a big commercial roof, all the materials and the techniques are the same.

Flat Roof Installation Torch Down- Whether we do a small roof over a garage or a big commercial roof

The siding is also a factor. In most cases, we try to use the existing flashing that’s under the old existing roofing material. We remove the old material carefully to dig the flashing out. Then we prepare the flashing for the new rubber roof. The reason we like to do it that way is that it will take longer to remove the siding and replace it with new again.

The rubber membrane got installed after all the preparation on the roof.

Watch the video on how to treat post flashing. It is important to have counter flashing over a post. So many times we find that the roof is leaking due to improper flashing on the post.

Flat Roof Installation on a garage roof

This is what makes residential roofs harder to do than commercial roofs. The siding, flashing, and railings are always what will take up most of the time. Thye confined area is also making it harder to move once all the tools and materials and workers are on the roof.

Image - Flat Roof Installation - Erik the cameraman before he took the business

Post of the railings were not flashed

Notice that there is no counter flashing on the posts. This is very common to see that post and railings are installed without proper flashing.

Post Railings on a flat roof were not flashed properly

Copper flashing for a post on a flat roof – Counter flashing

This is what the copper flashing looks like when it is installed around a post. The next image I will insert the post to demonstrate how counter flashing is working

Copper flashing for a post on a flat roof

Copper flashing fits around the post

This is the common mistake most people make when they install posts on a deck. They anchor the post to the roof and install copper flashing around it. This is where it ends.

The next image will show what counter flashing is

Copper flashing fits around post

Post sleeve installed over copper flashing

Counter flashing is when siding or a post sleeve covers the top edge of the copper flashing. Water can then not enter behind the flashing on the post.

Post sleeve installed over copper flashing

Post sleeve secured

After positioning the post sleeve and securing it, then a cap must be installed at the top of the post so water doesn’t leak in from there.

Post sleeve secured

Post Cap installed to secure the top

After the sleeve is installed, a post cap must cover the top to prevent water from coming in.

This is what counter flashing look like.

Post Cap installed to seal the top of the post