Title 16 - Buildings and Construction

16.110 Residential Code for One- & Two-Family Dwellings

16.110.R703.2

Section R703.2 of the International Residential Code for One- and Two-Family Dwellings is hereby amended to read as follows:

R703.2 Water-resistive barrier.

One layer of No. 15 asphalt felt, free from holes and breaks, complying with ASTM D226 for Type 1 felt or other approved water-resistive barrier shall be applied over studs or sheathing of all exterior walls. No. 15 asphalt felt shall be applied horizontally, with the upper layer lapped over the lower layer not less than 2 inches.  Where joints occur, felt shall be lapped not less than 6 inches.  Other approved materials shall be installed in accordance with the water-resistive barrier manufacturer’s installation instructions.  The No. 15 asphalt felt or other approved water-resistive barrier material shall be continuous to the top of walls and terminated at the penetrations and building appendages in a manner to meet the requirements of the exterior wall envelope as described in Section R703.1.

Exception:  Omission of the water resistive barrier is permitted if both of the following exceptions are met:

  1. 1.
    In detached accessory buildings that are not a dwelling.
  2. 2.
    In detached accessory buildings that do not contain conditioned space.

(History: Ord. BC-3286 §68, 2020) 

Effective on: 1/1/1901