Roof Repair
When making decisions on whether a roof can be repaired or if it needs to be replaced it is critical to know the composition of the roofing system. All roof membranes require a smooth hard substrate under them to facilitate seaming of the membrane components. Roof underlayments also offer insulation value and range from 1/2' wood fiberboard to thicker layers of closed cell insulation materials. The less expensive wood fiberboard or perlite insulation boards are very prone to absorbing moisture while the cellular insulations resist moisture intrusion. The type of roof deck on a building has a significant impact upon the service life on a roofing system. When a cellular insulation is installed over a metal roof deck, water that enters the roofing system typically runs around the insulation into the flutes in the metal roof deck. As a result what appears to be a big problem with a leak can be something that lends itself well for repairs. The more absorbent underlayments can absorb and retain moisture in the same type of situation. When the underlayment becomes saturated it needs to be replaced.
Another factor that enters the decision making process for repair vs. replacement involves the condition of field seams and flashings. These are the weakest portions of most roofing systems. Some single ply membranes are showing signs of performing well past their warranty period without showing signs of deterioration of the membrane. In these situations field seams and flashings can be repaired and the sustainable performance life of the roofing system can be extended another 5-10 years.
