Building Code and Building Construction - Questions and Answers Or when you want to know how construction is supposed to be done. |
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Dear Mr. Peck:
The short answers to your questions are:
1) Yes, a 1:2 slope is recommended. From our specifications:
- G. Trim, Projecting Architectural Features and Reveals
- - 1. All trim and projecting architectural features must have a minimum 1:2 [27 degree] slope along their top surface. All horizontal reveals must have a minimum 1:2 [27 degree] slope along their bottom surface. Increase slope for northern climates to prevent accumulation of ice/snow and water on surface. Where trim/feature or bottom surface of reveal projects more than 2 inches (51 mm) from the face of the EIFS wall plane, protect the top surface with waterproof base coat. Periodic inspections and increased maintenance may be required to maintain surface integrity of EIFS on weather exposed sloped surfaces. Limit projecting features to easily accessible areas and limit total area to facilitate maintenance and minimize maintenance. Refer to Sto details 1.04a and 1.04b.
- - 2. Do not use EIFS on weather exposed projecting ledges, sills, or other projecting features unless supported by framing or other structural support and protected with metal coping or flashing. Refer to Sto detail 10.61.
2) No, Through wall flashing is not required in all cases. The detail to which you refer appears to be a schematic (No. 8). This is not a complete detail and the flashing is not actually "through-wall" it is only through the EIFS and tied into the water-resistive barrier at the sheathing surface. Flashing would be required if the intent is to drain the EIFS or stucco above in order to get the water to the outside face of the building. In uninterrupted EIFS or stucco with build-outs the flashing is not required if the minimum slope requirements are met and a waterproof base coat is used where required as called for in the specifications above.
3) These answers are appropriate for both EIFS and Stucco buildouts.
I am attaching a couple of details for your information. While there may be some variations between different manufacturers, the basics of these answers are consistent among us.
Regards,
Terry L. Viness, P.E.
Sr. Technical Service Manager
Sto Corp.
Tel: 404.346.3666
Fax: 404.346.7422
tviness@stocorp.com
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