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Crawlspace Foundation Detail A
Heads Up
Single Family Residential One Story Addition
4
1
/
2
" x 10" steel anchor bolts 6'-0" O.C. max., 7" min. penetration max.
12" from corner and 12" from each end of plate (min. 2 bolts per plate).
Finished grade
#4 rebar min. continuous top of stemwall & at footing
36” min.
or below frost
6" min.
Provide #4 rebar vert. @
4'-0" O.C. insert rebar into
concrete footing or key way
Bottom plate shall be
treated wood or
Foundation redwood
3"
Note: Maintain at least 18" clear between
the bottom of the floor joists to the grade
level of the crawlspace, and at least 12"
under a beam.
The crawlspace access must be a minimum
of 18" x 24" and be unobstructed.
Basement may require engineered design.
Site Plan
1. When drawing your plot plan
be sure to show the location
of electric, gas, sewer and water service lines. If you don’t
know where they are, call the Public Service Utility
Notification Center of Colorado, 1-800-922-1987 or 811.
They will come out and locate lines for you. Remember
to ask them about the cost.
2. Show where the existing
electric and gas meters are
located on your home. These meters may have to be
relocated and it is best to know this before you start
construction.
Floor Plan
1. Smoke alarms and CO alarms.
Smoke alarms are required
to be hardwired and interconnected in new and existing
bedrooms, halls and one on each level unless removal of
interior wall or ceiling finishes would be required. In this
case, battery operated devices are acceptable.
Carbon Monoxide alarms are required on each floor with
bedrooms. They are recommended to be located no farther
than 15 ft. from any bedroom entrance. Do not install
within 15 ft. of a fuel burning appliances. Follow
manufacture’s recommendations for location testing and
replacement.
2. Additions not to enclose
bedroom or basement
egress windows.
3. Safety glass is required
at specific locations.
When you draw in the location of the new
windows on the floor plan, the plan reviewer
can identify which ones require safety glass.
4. Heat is required
in all habitable rooms. Show
how the addition will be heated on the plan.
Electric Code
Existing electric service
may require an upgrade
or relocation. Indicate the size of your electric
service (the number on the main breaker) on
your plan. This can help the plan reviewer
determine if an upgrade is needed before you
start construction.
Roof Overframe
When constructing a new valley, use a
continuous
board under the bottom cut of
the new rafters to provide a solid nailing
surface. The board should be at least 2" thick,
nominal and should be at least as wide as the
base of the new rafter.
Insulate wall or floor
per Chapter 11, I.R.C
Sealed with 6 mil. polyethylene film
Interior grade
Concrete Encased Ground
required for new service
This handout was developed by the Colorado Chapter of the
International Code Council as a basic plan submittal under
the 2015 International Residential Code. It is not intended
to cover all circumstances. Check with your Department
of Building Safety for additional requirements.