Foundation Moisture Protection
The UK horizontal DPC calculator is not offered for this region.
North American foundation dampproofing under IRC R406 is applied to vertical below-grade wall area and cannot be sized from wall length and masonry thickness alone. A future calculator must collect wall height, substrate, drainage and hydrostatic-condition inputs.
CACalifornia Building Code (Title 24)
References & Sources
Standards Cited
- IRC R406 — International Residential Code Section R406: Foundation Waterproofing and Dampproofing
Defines moisture barrier requirements for below-grade walls including dampproofing and waterproofing methods - IRC R404.1.6 — International Residential Code Section R404.1.6: Foundation Drainage
Requires foundation drainage and moisture protection for habitable below-grade spaces
Key Assumptions
- This horizontal masonry DPC calculator is unavailable for North American regions because IRC R406 dampproofing is a vertical wall-area system and the necessary wall-height and site-condition inputs are not collected. — IRC R406
- Dampproofing per IRC R406.1 required for below-grade portions of foundation walls enclosing habitable spaces — IRC R406.1
- Waterproofing per IRC R406.2 required where hydrostatic pressure exists — IRC R406.2