Professional deck-builders and DIY’ers alike should take note of a few upcoming changes to deck-building codes. Representatives from NADRA (North American Deck & Railing Association) recently attended the International Code Council Committee Action Hearing for the creation of the 2021 International Residential Code and posted a blog about the updates discussed at the hearing. Here are the high- lights in a nutshell, according to Glenn Mathewson, MCP – NADRA Technical Advisor.
GUARD POSTS RB185—The most collaborated proposal was related to guard post installation. The update prohibits
the notching of 4× 4 posts and includes code language requiring a post to be secured into the adja- cent framing of the deck, not just the single rim board. However, no specific hardware was specified, keeping the code generic and flexi- ble. The proposal was approved.
DECK FOUNDATIONS RB187—According to NADRA, this was a fairly simple proposal to make better sense of various deck foundation types, minimum depths and frost-depth exceptions. One clarification made was that decks attached to non-frost- protected structures, such as detached garages or sheds, will not have to themselves be frost protected.
Code Changes are Coming Deck Construction Update
Simpson Strong-Tie offers the DTT2 Holdown metal bracket, which help to fasten 4x4 guard posts to both the deck’s rim board and adjacent deck fram- ing, meeting the proposed code requirements.