One of the more common types of flat commercial roofing is the membrane roof. These roofs consist of a sturdy roof deck covered in a thick membrane that is designed to keep out the elements. A membrane flat roof can last for decades with minimal maintenance, but eventually, replacement is necessary. It's important to look for signs that you may need to have your roof replaced so the issue can be handled before major problems occur.
1. Seam Gaps
Roofing membranes over larger roof expanses will likely have seams. The seams are typically fitted and well sealed to prevent gaps from forming and to guard against membrane lift at the seam. Over time, though, the seams may separate or lift up. If the seam gaps are few, it is possible to have them resealed. Extensive gapping means it is better to replace the membrane, though.
2. Adhesion Loss
Different fastening systems are used, but adhesives usually play at least part of the role in securing the roof membrane to the roof decking. If the adhesive fails, then the membrane begins to lift up. It may become more prone to wind damage, where uplift can tear off all or part of the membrane during a windstorm. Failed adhesion is best repaired by replacing the flat roof membrane.
3. Extensive Blistering
A blister looks like a bubble in the center of the flat roof membrane. Blisters can be large or small, and there may only be one or there could be several. A blister forms when moisture gets underneath the membrane, either from adhesion loss or small pinprick leaks. Removing the old membrane is necessary as there may be water damage to the decking below. Minor damage can be repaired before you need to get a membrane replacement, while major damage may also mean the decking needs to be replaced.
4. Acid Damage
Acid damage can occur due to pollution, but often it is the result of heavy amounts of bird droppings on the roof. The acid eats away at the membrane until it becomes brittle and full of holes. If this is the case, a membrane replacement is necessary. It may also be necessary to put some bird scare devices on the roof to prevent future damage.
5. Major Punctures
A small puncture can be patched if it is caught early enough. Major punctures that also penetrate the roof decking often can't be patched effectively, nor can small punctures that weren't fixed before water damage affected the decking beneath. For these punctures, the decking will need to be repaired or replaced before the new membrane is put on.
If your roof has one or more of these damage types, it is time to contact a flat roof replacement contractor.
