Morris County Roofers: Article About Different Roofing Materials
A roof is more than just its wooden sheathing and a layer of shingles or tiles. An entire roofing system is made up of many layers, which can include a vapor barrier, air controlling materials and a thermal resistance layer. The amount of protection that a particular house needs from each of these layers depends on the roof's slope, the home's age and its location. Homeowners in need of a replacement roof or who are building a new house can work with experienced Morris County roofers to ensure that their homes are adequately protected from the weather.
A vapor or water resisting barrier is an important part of the roofing system. It works to stop condensation from moving through the roof's shingles, underlay and decking and reaching the attic space. Vapor barriers must have a permeability of less than 10. Some of the most widely used vapor diffusion retarders include polyethylene sheeting and Kraft paper. Polyethylene sheeting is usually applied on top of an attic's existing insulation. Kraft paper is typically a part of the insulation's facing and is often found on rolled fiberglass.
The next layer that homeowners should consider having their roofers install is a material that controls air flow. In most situations, roofers select a type of insulation that can do this, as the material will then do double duty of also controlling heat flow.
The roofing experts from Peter W Smith Construction of Morris County NJ would be happy to answer any questions you have about roof repair or roof replacement.
Rigid foam insulation and closed cell spray foam insulation perform both of these functions. The sprayed foam is also able to control vapors and liquid water. Property owners who want to get the most bang for their bucks usually select the sprayed polyurethane foam. Only about 4 inches of the foam is required to achieve the U.S. Department of Energy's recommended R values for New Jersey.
If a homeowner does not want to combine heat and air controls, then the attic will need to be air sealed with materials such as caulk and roofing cement. The heat control can then be accomplished with the use of rolled fiberglass, loose fill or blown in insulation. Additional heat control can be achieved with the use of a radiant barrier.
When a homeowner prefers something other than closed cell sprayed foam insulation, other insulating materials can still do multiple functions. Open celled foaming insulation controls both heat and air flow and does not contain the chlorofluorocarbons that are used in the closed cell foams. Foam insulating boards can often control liquid water, water vapors, heat and air as well.