Frame It Right! Back to Basics for Big Buildings

The demand for commercial and multifamily construction is soaring, and the framing industry is expanding to meet this demand. APA – The Engineered Wood Association has walked hundreds of job sites and identified the most common wood construction framing errors found in today’s nonresidential buildings. This session examines the consequences of these framing mistakes from the ground up, providing practical solutions for avoiding typical issues using APA’s resources as a guide. This course is approved by AIA (1 HSW/LU) and ICC (0.10 CEU). Note: Do not navigate to YouTube if you require a certificate. A downloadable certificate of completion is available only when this webinar is viewed on this webpage in entirety, after completing a brief questionnaire.

Approximate length: 1 hour.


Webinar Participant Questions and Answers


How are large circular holes made in I-joist framing members? With a jig saw?

There are a number of power tools available in the market place for cutting large circular holes. The critical requirement is to leave a minimum of 1/8” of web material between the top or bottom of the hole and the adjacent I-joist flange. Do NOT cut into I-joist flanges. For more information please refer to APA Performance Rated I-Joists, Form Z725.

What is the "fix" if you cut the I-joist flange like the photo with the sewer pipe?

Contact the engineer of record or the I-joist manufacturer for possible field solutions.

What is APA's recommendation for fire rated construction detailing?

This is a broad question. For more information on fire rated construction, refer to APA’s Fire-Rated Systems webpage. Also, the American Wood Council has a free publication, Design for Code Acceptance (DCA) 3 - Fire-Resistance-Rated Wood Floor and Wall Assemblies, which describes how interior and exterior wood-frame walls and wood I-joist floors can be used to meet building code requirements for fire-resistance-rated assemblies.

You mentioned the requirement for an 1/8" gap between panels, but how can the panel expand or contract if it is glued and fastened to the floor supports?

APA fastening recommendations account for the use of AFG-01 adhesives with subfloors.

For more information on preventing panel buckling see APA Builder Tips: Prevent Buckling with Proper Spacing, Form M300.

In the continuous load path picture showing exterior sheathing continuous over the rim, isn't this a poor detail, considering the potential for buckling due to shrinkage at the rim/plates?

Using an engineered wood floor assembly is one way to minimize the amount of shrinkage in this zone. Note that the building code only requires shrinkage to be evaluated in buildings over 2 stories in height. Additional information is available in Data File: Shear Transfer at Engineered Wood Floors, Form Y250.

Would it be good policy to add 1/8" to wood supports of headers due to shrinkage of the header?

Consider using LVL, LSL or glulam headers to minimize potential header shrinkage. A variety of engineered wood plates can also be specified to help minimize shrinkage in taller wood buildings.

How many days can "Exposure 1" panels be exposed?

There are many factors that affect the durability of wood structural panels and each situation is unique. Therefore, it is impractical to define an acceptable moisture exposure due to construction delays under all circumstances. Factors such as geographical location, seasonal weather patterns, and local weather history should be considered. Likewise, construction conditions that cause accumulation or dissipation of moisture will influence the effects on the panels. The longer panels are exposed and the more severe the exposure, the greater the effect on the panel performance. Although it is a function of both time and severity of moisture exposure, panels that are exposed to long construction delays may be unaesthetic yet remain structurally sound.

If a 16" or 18" I-joist is used in roof framing, can the eave portion be cut outside the wall bearing end to reduce the eave depth to 10" or 12" depth on the cantilevered eave?

I-Joist Construction Details—Performance Rated I-Joist Roof Framing Details, Form D710, provides several details to reduce the eave depth. Details 1r; 1s; 1t; 1u.

Do you have shear values for clipped head nails typically provided in nail guns?

Many collated nails used with nail guns are actually of smaller diameter than standard common nails. For example, frequently available “8d gun nail” diameters might correspond to 8d cooler, 8d box or 8d sinker nail diameters (0.113 inch). In fact, in some regions of the U.S., gun-driven common nails are not stocked by distributors and may be available only by special order.

Using the NDS equations, a 15 percent reduction in shank diameter leads to approximately a 25 percent reduction in the lateral load resistance (assuming other variables remain equal) for typical wood-structural-panel-to-framing connections.

For additional information, see APA Technical Topic TT-087, Shear Wall Test Results Comparing 8d Common and 8d Box Nails. For other specifications on staples and other power-driven fasteners, contact the International Staple, Nail and Tool Association (ISANTA). ISANTA authors the ICC Evaluation Service Inc. Report, ESR-1539, which provides tables recognizing power-driven fasteners including nails and staples. ESR-1539 is available online at:

Where does one find shear values for staples?

The 2012 and 2015 International Building Code Tables 2306.2(1) and 2306.2(2) are wood structural panel diaphragms fastened with staples. Table 2306.3(1) is for stapled shear walls. APA's Diaphragms and Shear Walls Design and Construction Guide, Form L350, includes provisions for stapled high load diaphragms. And Table A-2 provides fastener slip equations for 14-ga staples. For other specifications on staples and other power-driven fasteners, contact the International Staple, Nail and Tool Association (ISANTA). ISANTA authors the ICC Evaluation Service Inc. Report, ESR-1539. which provides tables recognizing power-driven fasteners including nails and staples. ESR-1539 is available online at:

Where do you find shear values for T1-11 sheathing?

The shear values for 303 siding panels (T1-11 sheathing) installed directly to the studs or over gypsum sheathing are included in Table 23 of the Engineered Wood Construction Guide, Form E30, APA Rated Siding and Footnote m. The thickness at the point of nailing at panel edges determines allowable shear wall values. This is also true for diaphragm values for grades other than Structural I.