Foam (or Sprayed Polyurethane Foam – SPF) roofing involves a method or process of pumping a combination of two liquid components – isocyanate and plyol (a type of resin) – to form a seamless, solid, stable, lightweight, and massive closed-cell roofing membrane or substrate covering the entire roof. Foam roofing features exceptional thermal insulation and superb water resistance.
Foam roofing contractors in Phoenix, AZ thoroughly clean the surface area for the proper application of SPF. The roofers make sure that the surface is totally dry and free of contaminants like oil to properly secure the substrate in compliance with the local building codes. The required elastomeric top coat is afterwards applied to protect the substrate and this is usually done manually, by spraying, or with the use of power rollers.
There are many advantages of foam roofing over conventional roofing systems. Several of these are:
- Excellent leak protection because there are no joints or seams which are usually the source of many roof leaks in conventional roofs. Features a unique thermal insulation quality and does not soak up water like foam boards.
- Foam roofing is lightweight, typically weighing 50 lbs. per square foot, compared to 100 lbs. for single-ply roofing or 800 lbs, for built-up roofs (BURs).
- Helps lessen cooling and heating costs.
- Lasts longer and does not need a lot of repairs and maintenance.
- SPF uses environmentally friendly materials.
- The flexible quality of SPF allows it to be sprayed on almost any surface, even on protrusions and irregularly shaped structures.
However, this type of roofing is not suitable for all or most residential or commercial buildings. A standard foam roofing installation generally consists of three major elements. These are the roof deck, the SPF mass, and the elastomeric top coat. Even if a foam roofing system is not quite new to the low-slope roofing business, a large number of roofing contractors prefer not to use this type of material because of some of its drawbacks and these are:
- There are strict installation instructions for SPF such as certain weather conditions, temperatures, and humidity when it can only be applied. Warm and dry with no wind is the favorable weather condition for applying SPF. Failing to comply with this can cause blistering or surface moisture on the foam. So it could take months for installing foam roofing if the region is cold, breezy, or humid.
- Adequate drainage is very important for the safety of flat or low-slope roofs so any variation in the method that the roofer performs the spraying of SPF might end up in uneven surfaces that could create ponding or areas that retain water which can reduce the life of the roofing or lead to more damage.
- SPF’s adherence feature and longevity can be greatly affected if improper surface preparation is ignored like cleaning the roof decks with contaminants, metal, gravel, or remnants of old roofing.
- The thermal resistance of SPF depends on the roofer handling the spray containing the mixture to create the foam. A slight difference in the chemical ratio can affect the density of the SPF layer.
- There are potential risks from the fumes emitted during the spraying process.
Foam or SPF roofing is a high-quality product that has become popular and is a favorite choice for flat or low-slope roofing material.