Roof Insulation

Insulation is a pretty popular word in all types of construction because it is required by building codes and it can cost and / or save an owner big money, especially over time.  On flat and low slope roofs it must be considered closely in new construction and in roof replacement situations.

Your building code will dictate how much insulation you need when you build something new and sometimes may dictate what to use when you are reroofing.  An important thing to know is that when putting on a new roof, it is a good time to evaluate how your home, office or church is doing in the insulation department.

Make sure you consult your roofer when deciding what to install.

Roof insulation is designed to keep heat or cold in or out of the building effectively.  Insulation is measured by R Value. This is a measurement of the resistance of a building material to heat flow. The more resistance to heat flow in the material, the higher the R Value will be.

The most commonly used roof insulation is a rigid board called polyisocyanurate insulation and it is definitely good stuff.  It comes in different thicknesses and therefore different R Values. One inch thick “iso board” has an R Value of about 5.5 whereas one and a half inch is R9.  The R value goes way up, but normally we do not install more than R30 on a roof.  It may be installed in layers too.

Roofers attach insulation to the roof deck or sheathing and then install a single – ply membrane roof such as TPO, E.P.D.M., MODIFIED BITUMEN or even a built up roof system on top of it.

If your building is too hot in the summer or too cold in the winter, adding more R Value on the roof may contribute to fixing the problem. Old buildings sometimes have none at all.

Good luck!

Robert Andrews, II
757-286-7400 (cell)

Ventilation Requirements for Your Roof

When you install a new roof on your existing home or business or when you are building a new structure, (which will have a roof on it), it’s a good time to brush up on ventilation requirements.

Over the years ventilation knowledge and technology have changed. I have been in old buildings and residential homes which have no vents at all. I have also seen 10 year old homes with improper or insufficient ventilation.  Proper ventilation will provide you with an attic that is not too hot or moist which can cause problems. Bad ventilation can allow mold, condensation, wood rot, shortened shingle roof life, higher energy bills, etc. I have been in attics that are completely wet to the touch and by sight on the bottom side of the roof sheathing because of lack of vents. We vented it and it dried right up. When getting roof consultations or estimates, ask the contractor if your vents are ok for your home. He should know much about it.

A proper ventilation system is balanced. The intake at the eave should be equal to the exhaust at the ridge. This makes for an even flow of air to keep the attic and roof deck in ship shape. Different climates have different air volume requirements.

Make sure you do not have conflicting types of vents on your roof like a power fan beside a slant back gravity vent , for example.These are both exhaust vents and that fan will probably pull air into that slant back vent making it an intake vent. This is like a short circuit in electrical systems.

This is just basic and general info about roof and attic vents. Your roofing contractor should be able to evaluate your home and either replace your vents with new ones, if your system is good,  or change the way your house vents all together. It will pay off in the short and long runs if you handle it at new roof time.

Bad ventilation will void your shingle warranty and shorten the life of your roof. This is true in asphalt or wood shingles or shakes. We like to use AIRVENT products because of their quality, availability, variety, customer service, and training.


Many architectural or dimensional asphalt shingle roofs are now made with limited lifetime material  warranties if installed and vented properly. Our favorite type of exhaust roof vent is ridge vent because it is at the ridge and is continuous ventilation which leaves no “hot spots” under the roof deck.

Thanks and have a good day!

Robert Andrews II

New Roof, No Mess!

That is right. During your roof job, it looks like maybe you are having minor  work  done because 99% of the old roof coming off never hits the ground!  We now have a new piece of equipment known as “The Equipter.” There are less than 500 of them in existence today.

the EquipterThe Equipter is a medium size dump trailer that goes up in the air to receive trash. It is self propelled and has big, wide  wheels that won’t damage your yard or  beds. The job site stays much cleaner and safer and the job takes less time to complete because the trash never hits the ground. We only touch it once instead of a second time picking it up in your yard.

When a residential shingle roof is replaced, tons of trash are removed and tons of new roofing are put back on. The average home has about 8,000 lbs. of shingles to remove and dispose of. A big part of the job is to manage this trash and keep it from damaging property.  This Equipter makes it much easier and faster to complete your roof job. It is especially appropriate if you have a well-maintained yard. A 1.25 day roof now only takes 1 day!

It is also a pretty cool thing to watch in your yard. Anyway, Thanks and have a good day!

Robert Andrews II, President