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

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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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