Fiber Cement Siding Building Penetrations - Allura USA
[Pages:2]TECHNICAL BULLETIN
Fiber Cement Siding Building Penetrations
Penetrations
As a best practice for building penetrations 1?" in diameter or larger, such as hot air vents, hose bibs, and light and electrical outlets, a mounting block should be installed to restore the weather-resistant barrier of the home after cutting a hole for the penetration.
Refer to the illustrations shown here for the proper cutting and installation of Allura Fiber Cement Siding around trim blocks for a variety of external pipe and receptacle penetrations. The installation is basically the same for all applications referenced.
Mounting Blocks
Mounting blocks can be created from cutting sections of 5/4", 4/4" Plycem Fiber Cement Trim Board or by using pre-fabricated mounting blocks and flashing products that are available for purchase.
5/4", 4/4" Plycem Fiber Cement Trim Board Note: Use 5/4" for Lap siding and 4/4 for Vertical Panel
Receptacle Outlets Standard Lights
Dryer & Hood Vents
Spigots Gas Lines Bibb Lines Doorbells
Hot Air Vents
The trim block must be mounted directly over the sheathing and weather-resistant barrier. For pre-existing vent pipes and hose bibs, the trim block must be cut into two pieces to retrofit around the existing pipe. The dividing cut must be made on a 22.5 degree weather cut angle.
Sheathing
Z Flashing WeatherResistive Barrier
Starter Strip
Don't Caulk 1/4" Gap
(Continued on reverse side)
Minimum 22.5? weather cut
Cut trim block into two pieces to retrofit around existing vent
Allura Fiber Cement Siding
? 12/14 Allura, Printed in U.S.A.
Allura USA | 15055 Woodham Drive | Houston, Texas 77073 | 1 844 4 ALLURA (1-844-425-5872)
? 12/14 Allura, Printed in U.S.A.
TECHNICAL BULLETIN Penetrations
Lighting and Electrical Outlets
Install a piece of Z Flashing over the top of the trim block.
Install a starter strip over the top of the Z Flashing and the trim block when required to shim gap.
The Allura Fiber Cement Siding should be cut and installed around the trim block leaving a 1/8" gap at the bottom and sides and a 1/4" gap at the top.
Do not caulk the top 1/4" gap. Do caulk bottom and side 1/8" gaps.
Sheathing Z Flashing
WeatherResistive Barrier
Sheathing Z Flashing
Starter Strip Starter Strip
WeatherResistive Barrier
Don't Caulk 1/4" Gap
Allura Fiber Cement Siding Don't Caulk 1/4" Gap
Allura Fiber Cement Siding
Spigots and Hose Bibs (larger than 1 2 diameter)
Sheathing
Starter Strip
Z Flashing
Vinyl Mount Master
WeatherResistive Barrier
Don't Caulk 1/4" Gap
Wire, Conduit, or other Fixed Pipes (less than 1 2 diameter)
Sheathing 1/8" Gap
Allura Fiber Cement Siding
Seal with foam or caulk
Allura Fiber Cement Siding
WeatherResistive Barrier
Note: No trim block required for conduits, wires or pipes less than 1?" diameter.
? 12/14 Allura, Printed in U.S.A.
Allura USA | 15055 Woodham Drive | Houston, Texas 77073 | 1 844 4 ALLURA (1-844-425-5872)
? 12/14 Allura, Printed in U.S.A.
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