This e-article is about installing anchor bolts in designing a home foundation
Guidelines to follow are an accumulation and amalgam of the literature and work at the granite knee of life experience
Anchor Bolt Installation
For wood stud wall anchorage, anchor bolts
shall be placed in all exterior grade beams and
shall be placed in those interior grade beams supporting bearing walls
shall be a j-bolt
with j-hooks only faced to greater cover
Comment:L-hooks'll do, but not preferably.This custom home designer thinks it's preferable not to relatively weaken every other anchor bolt by pointing to lesser cover and it's preferable to run the rebar down through the "j"s than tie-off "l"s to them.
shall not be less than 5/8 linear inch diameter
Comment:Forget about 1/2 linear inch diameter anchor bolts by the same token that you can forget about 1/2 linear inch exterior wall sheathing and roof sheathing
shall be fortified with a continuous #5 rebar over the short bend
shall be galvanized or otherwise appropriate to the wood preservative used to treat the mudsill or sill plate, noting that
if borate (a/k/a dot, or disodium octaborate tetrahydrate) is the wood preservative, then the wood so preservative-treated shall be applied only in persistently dry areas, e.g.,
most mudsills or sill plates, unless otherwise noted and
no special materials are required either to coat or comprise the fasteners, flashings, etc. beyond those applied either to untreated lumber or CCA (chromated copper arsenate)-treated lumber
shall be in embed depth not less than 12 times diameter, or about 7.5 linear inches, unless otherwise noted for deeper embed
shall be spaced at
not greater than 48 linear inches on center commonly and
Comment: This spacing is tighter than common by 2 linear feet, intended to secure with an abundance of caution and better hold mudsills and soles flat
not greater than 16 linear inches on center in
high wind-resistance area
seismic zone 2B and up
Comment: This even tighter spacing is to mitigate agains sills' splitting.
not greater than 9-12 linear inches from
either side of any corner
the interior wall side(s) of any intersection(s)
any butt
either side of a beam pocket
not less than 2 per member
shall bear using suitable Simpson bearing plate BPS or LBPS 3 linear inches x3 linear inches or not less than equivalent in lieu of flat or other washers
shall not be less than most recent ASTM a-307 (a/k/a American Society for Testing and Materials, "Carbon steel bolts, studs, 65,000psi pencil straight, externally threaded fasteners")
shall be specifically, expressly suitable for application with chosen wood preservative
such bolt shall penetrate
in a hole predrilled
to unthreaded depth and
in diameter
not less than 1/32 linear inch and
not greater than 1/16 linear inch larger than the unthreaded shank's diameter and
in a hole predrilled for the threaded depth in diameter
not less than 1/32 linear inch and
not greater than 1/16 linear inch narrower than the threaded shank's root diameter
such bolt's hex nut shall be run home by wrenching
which wrenching shall pock but not penetrate sill surface
In a Foundation Plan, this custom home designer
draws in anchor bolts one at a time in plan view
shank, head-on
big, square bearing plate
hex nut
foundation designing-in conformance with precepts herewith
Foundation Plan, Excerpt, Highlighting Designing-In Anchor Bolts
Comment:Takes the guesswork out of figuring about where and how many anchor bolts will do.
Comment: Optionally and with the consent of your local building authority having jurisdiction, you may consider Simpson Strong-Tie's mas mudsill anchor as a simple, cheap alternative.http://www.strongtie.com
Other types of anchors
shall be acceptable, such as
powder-actuated fasteners
drilled epoxy anchors and
mudsill anchors
depending on
nature and character of application and
subject to local authority having jurisdiction
except that extreme care must be taken with applications involving
existing substandard, placed concrete, e.g., some WWII residential placements, wherein
any CMU, or concrete masonry unit, or brick and block
whereby
dowels and anchors shall not be driven or expanded but rather drilled and doweled
spacing for the alternative anchors shall be determined using the shear capacity and uplift load for 5/8 linear inch diameter anchor bolts
specifications may be done by others
Note that each 5/8 linear inch diameter anchor bolt
shall have a shear capacity of not less than 1,500 pounds and
shall resist an uplift load of not less than 1,400 pounds
spacing for the alternative anchors shall not exceed the spacing for the 5/8 linear inch diameter anchor bolts specified above
Before The Architect designs and drafts custom home plans nationwide. Its principals Ralph and Jean Pressel have worked hands-on together since the ‘60s in custom home design, drafting, consulting, plus building and repair in every major trade.Their plan sets are extraordinarily detailed; their clients' active involvement throughout is essential.
Home Design Standards - Home Building Standards 4Q08 Edition e-book at 823 pages and the website www.beforethearchitect.com at nearly 1000 pages of text and illustrations are enterprises of Before The Architect’s principals.
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information presented herein intended to substitute for the advice provided to you by any health care or other professional
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