Provide continuous vapor barriers on the decks under the roofing.
Requirements of good roofing system.
The national roofing contractors association nrca recommends expanded polystyrene insulation intended for use as rigid board roof insulation have a minimum density of a nominal 1 25 pounds per cubic foot that complying with astm c578 type viii having a minimum density of 1 15 pounds per cubic foot.
The roof covering should have adequate resistance to resist the effect of weather elements such.
Find out how all the components work together to keep moisture out your energy costs down and your house looking terrific.
The roof guy post author july 31 2018 at.
The use of thermal insulation in roofs or roof assemblies must be evaluated in conjunction with the type of roof system.
The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that.
Defend helps protect against nature s elements.
As stated in the 2006 ibc roofs must serve to protect the building.
Hi eilene congrats on getting 30 years of service lifespan from the old asphalt roof.
Seal helps create a water proof barrier.
It will support roof.
A roof system is so much more than shingles.
Installers should follow code requirements energy standards and manufacturer s guidelines for the use of insulation in an approved roofing assembly as they may differ across industries and product types.
Breathe for balanced attic ventilation.
This requires roofs to resist high and low temperatures rain wind driven rain high winds exposure to ultraviolet radiation and in some areas snow ice formation and hail stones.
It takes more than shingles to protect your home.
It takes an integrated system of components and layers designed to help perform in three critical areas.
For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended.
The roof structure should be strong and stable enough to take up the anticipated.
Total protection roofing system total protection is more than shingle deep.
This will help keep water away from curb flashings says peterson.
High wind shingles are rated for 130 mph.
To acting as a structural diaphragm in certain situations.
Elevate perimeters of roofing deck surface with canted and tapered insulations.
Find out how all the components work together to keep moisture out your energy costs down and your house looking terrific.
The roof should satisfy the following functional requirements.
Clearly your gable venting system is adequate otherwise your roof wouldn t last as long as it did.
