Arizona Roofer

Your Roofing Questions Answered

Tag Archives: built-up

3 course repair

June 27th, 2009
This is how you make a basic repair this is commonly known as a 3 course repair. Materials you will need.

1. Asphalt Roof Cement  or commonly known as “Wet patch , mastic”

2. reinforcment  webbing

3. Trowel

4. Gloves

Doing a basic wall repair like this can save you a lot of money, and is very easy to do.

This is a standard method of repair and can be used on built-up or SBS modified bitumen systems.

Step 1:

Make sure the area is clean from dirt and other debris. If necessary scrape old roofing material off.

Split roofing

Split roofing

Step 2:

Apply a thin layer of wet patch to the area to be repaired approxamately 1/8 thickness  (make sure to apply wet patch at least 2 to 3 inches wide around the entire area of repair).

Apply wet patch

Apply wet patch

Step 3:

Place the reinforcement webbing. Center the webbing with the split.

Apply reinforcement webbing

Apply reinforcement webbing

Step 4:

Apply another thin layer of wet patch on top of the  reinforcement webbing.

Thin layer of wet patch

Thin layer of wet patch

The final repair should look like this. You can apply some aluminum roof coating over the top if you wish, but its not nessecery.

Finished repair

Finished repair

The above pictures are for illustration purposes for a typical 3 course repair only. This type of repair is used on built-up or SBS modified bitumen systems. Or also known as “rolled roofing”.

Built-Up Roofing

June 25th, 2009

Description:

 

Built-up Roofing consists of alternate layers of roofing felt and individual moppings of “Hot Asphalt.”  Built-Up Roofing may include either 3 or 4 piles of roofing felt.  Top surfacing can consist of gravel, smooth of granular surfaces similar to the look of a roofing shingle.

 

Uses:

 

A Built-up Roof is the most common type of roof for flat applications.  They can be installed over insulation, on metal roof decks, or directly on plywood roof decks with or without insulation.

 

Life Span:

 

A Four-Ply Built-Up roof will last 9 to 11 years and a Three-Ply normally lasts 6 to 8 years.  If the roofs are professionally maintained, they should last another 4 to 5 years.

 

Caution:

 

  • Asphalt is the waterproofing.  Be sure to install enough asphalt.
  • Although over heating the asphalt during installation aids the crews to install a job faster, it lowers the quality of the roof.  Use proper techniques to insure the best installation and quality of your roof.

 

 

Limitations:

 

  • It’s recommended that the old roof be removed before re-roofing.
  • Proper flashing details are critical to ensure a roof that will last.