CIRCULAR
PLANNING AND DEVELOPMENT DEPARTMENT
Current
Planning and
Development
Division
Phone:
250-561-7611
Fax:
250-561-7721
Concrete Slab
& Damp Proofing:
Single Family Code Specifications
CONCRETE SLABS-ON-GROUND
The following are minimum requirements for concrete slabson-ground:
1) Application of 4" of compacted granular material on
top of native soil.
2) Waterproofing and radon gas protection with a ground
cover of 6 mil UV-rated polyethylene to be applied so
that:
a. Poly overlaps 12"
b. Poly layering under all teleposts
c. All penetration (plumbing, other objects) sealed
with duct tape
d. Poly sealed to walls with flexible sealant
This guide has been
prepared to provide
convenient information
only. It is neither a bylaw
nor a legal document. If
any contradiction
between this guide and
the relevant Municipal
Bylaws and/or
applicable codes is
found, such bylaws
and/or codes shall be
the legal authority.
July 2003
3) 3" thick slab (excluding concrete topping)
4) The finished surface of the concrete floor slab is
trowelled smoothly and evenly.
Figure 1
WALL DAMPPROOFING and DRAIN TILE
1) Masonry walls to be parged on the exterior face below ground level with not less
than 1/4" of mortar.
2) Holes and recesses resulting from the removal of form ties shall be sealed with
cement mortar or damp-proofing material.
3) Bituminous or other damp proofing material shall be applied over the parging or
concrete below ground level.
4) Unless it is shown to be unnecessary, the bottom of every exterior foundation
wall shall be drained by drainage tile or pipe laid around the exterior of the
foundation as follows:
a. Drain tile or pipe shall not be less than 4" in diameter.
b. Drain tile or pipe shall be laid on undisturbed or well-compacted soil.
c. Top of the drain tile or pipe shall be below the bottom of the floor slab or
crawl space.
d. The top and sides of drain pipe or tile shall be covered with not less than 6"
of crushed stone or other coarse or clean granular material.
e. Drain tile shall be gravity installed.
Figure 2
DRAINAGE DISPOSAL
Foundation drains shall drain to City storm sewer (if available), drainage ditch or dry
well (not to sanitary sewer).
You may find additional and/or specific information in other circulars available at
www.princegeorge.ca.