Todd Hallett, AIA, President of TK Design & Associates, Inc. (tkhomedesign.com) has been designing award winning homes for over 20 years. He spent 15 of those years working for a $50 million production building company. Todd designed all of their homes but also worked in every other aspect of the company including purchasing, development, land acquisition, product development, and operations, and was President of the company for three years. Equipped with his vast building experience and fueled by his love for architecture he left to form an architecture firm that is second to none in working cohesively with Builders. Todd specializes in Lean Design and works, alongside Scott Sedam of TrueNorth Development, in the trenches with builders, suppliers, and trade contractors. His Lean Design blog appears weekly at Housingzone.com. Todd welcomes your feedback at firstname.lastname@example.org or 248.446.1960.
Exposed: The most common framing mistake in home building, Lean Tuesday with Todd Hallett
Headers, headers everywhere! Nearly every builder I have ever worked with (regardless of geography) initially had far too many headers and/or headers that were way oversized in their homes.
Code requirements are typically 250 percent over failure, so designing above code is typically a waste. An exception is that there are pocket markets where customers require joist design a bit above code to avoid perceived floor deflection or bounce.
It’s easy to do a quick check.
Do a field walk during framing:
- If a header is running parallel with the joists above (in the case of a two story) it is suspect and may not be required.
- If a header is running parallel with a truss or rafter system it is also suspect and should be reviewed.
- Look at your plans. If a header has no way to bear on a footing or a beam it may not be required.
Exception: Watch out for point loads created by purlins, headers, or other structure above.
Why are headers overbuilt so often? It typically starts with a header schedule on the plans. A header schedule is a generic table indicating the size of headers required over given openings. For example a 36-inch opening may indicate (2) 2x6 headers. What this translates to is that the framer will put headers over every opening and the size of the header will be dictated by the schedule. This is simply wrong! Many openings in a home do not require structure.
The solution: get rid of the generic schedule and have each opening engineered by a Lean engineer. The upfront cost associated to proper planning is miniscule compared to the costs of overbuilding your structure. Get your framing crew(s) and your project managers on board and you will immediately start saving some serious moola.
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