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Overview of the roof :
Starting with 4 x 6
aluminum I-beams welded 4 x 4 aluminum to the I-beam to form the
framework of the roof system. Each aluminum 4 x 4 has a welded foot
(plate) aprox. 6 in x 10 in . Each foot has 6
drilled holes to accommodate six
ITW Redhead expansion bolts. On top of the
frame we installed a commercial product knows as Tectum III. Tectum III
is a combination structure and insulation product. It is
sandwiched with 3/4" OSB on the top and a fiberglass looking
material at the bottom. Tectum III has a tongue and groove application.
The Tectum III we selected is 8" thick. When it is laid on top of
the AL and tapped into place, a 10" self-tapping sheetmetal screw
with a washer is drilled thru the Tectum and into the AL frame. You have
to have a certain number per inch for the warranty to be good. Tectum
III is very strong structurally because of the 3/4" plywood on one
side and the reinforced fiberglass on the other side. It also possesses
an R-value of 43 for insulation properties.
On top of the Tectum III is a layer of
tongue and groove 3/4" plywood. On top of the plywood is a layer of
a product called SharkSkin Roofing Underlay
which is the real waterproofing agent for the
roof. To install it, you peel the backing off of it and lay it
horizontal layers on top of the plywood. If a nail is driven thru this
product it will form a seal around the nail maintaining the waterproof integrity
of the roof. For an extra measure of strength wind resistance and to
insure 100% waterproofing we installed a second layer of 3/4"
tongue and groove plywood turned perpendicular to the first layer with
another layer of Sharkskin on top of it.
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