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Asphalt Analysis
An asphalt analysis shall be based upon an examination
of a 4" x 40" rectangular test cut specimen in accordance with
ASTM D 3617. The contractor shall cut the test specimen and adhere it
back into place as well as adhere additional sheets equal to the quantity
specified over the replaced test cut. The specimen test cut shall be examined
for voids, and if any voids are detected they shall be checked against
the following criteria:
1. Overlapping voids between two or more sheets are unacceptable.
2. The maximum acceptable length of any single void encapsulated in asphalt is 2".
3. The total length of all voids encapsulated in asphalt shall be less than 4" between any two sheets.
4. Dry voids, the absence of asphalt between sheets, are unacceptable.
5. Voids continuous through the specimen are unacceptable.
6. Interply moisture in voids is unacceptable.
7. Sheet shall not touch sheet in any location.
Shall examination indicate a lack of the correct quantity of asphalt, additional ASTM D 3617 test cuts shall be made at four locations diagonally, 10 feet in each direction from the original test cut. Repeat the test cuts until the deficiency no longer exists, and install the specified sheets and asphalt over the affected area.
Roof System Membrane Construction
The strength of the roof system membrane is dependent
on the type, quantity, lapping, and overall layer construction of the
reinforcing sheets. The correct side laps, end laps, and head laps must
be maintained. Side lap is the overlap distance along the length of a
reinforcing sheet where one sheet overlaps the adjacent sheet. End lap
is the overlap distance that is measured from where one sheet ends and
where another sheet begins. Head lap is the distance of the overlap between
the lowermost and the uppermost ply sheets of the shingled roof membrane
when measured perpendicular to the long dimension of the roof membrane
. See Illustration 1.
Daily Installation: The installation of all reinforcing sheets started during the day shall be completed in the same day including the reflective surfacing or an asphalt glaze coating. Phased installation is prohibited. The reflective surfacing may be delayed for up to six months.
Install M60 RubrPoly Reinforcing Sheets
to Construct Flashing Membranes
A cant shall be installed at the base of vertical
transitions such as walls or penetrations to provide a transition for
the roof system membrane. The RubrPoly flashing sheets shall extend the
specified distance from the surface of the horizontal roof, over the cant,
and the specified distance up the vertical surface of the wall or curb.
A counterflashing is required to be installed so as to waterproof and
protect the top of the flashing and roof membrane sheets.
Flashings: Flashing membranes shall be completed on a daily basis. Non-asphalt surfaces such as concrete and metal surfaces that come into contact with asphalt roof system components shall first be primed with M400 RubrPrime, and the primer shall be allowed to dry prior to further installations. Metal wall or curb caps and counterflashings shall be secured with M300 RubrMastic and mechanical fasteners per the "Roof Flashing Details" section. No condition shall be allowed that would permit moisture entering behind, around, or under the flashing and roof membrane sheets. Temporary flashing installations shall be monitored daily for lap openings and voids that may allow moisture to enter.