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MASB/MAS/MAB/MA MUDSILL ANCHORS
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See page 9 for additional product illustrations.
The MASB is designed for installation on concrete masonry units, and to meet the
requirements for BOCA Building Code Section 2305.16.
MAS -- For slab or stemwall construction. Fast for the finisher -- install before
pouring concrete by nailing into form, or insert into concrete after pour. Finish up to
the edge of slab. No anchor bolts to hand trowel around, no nuts or washers to lose. Fast
for the framer -- eliminates plate drilling and mislocated anchor bolts.
MAB -- Anchors mudsill to concrete block or slab foundation.
MA -- A low-labor, high-value method to secure mudsills to monolithic slabs or
foundation walls. Can be installed before sill placement or attached to sill and wet set
in place.
MATERIAL: MASB, MAS and MA -- 16 gauge; MAB -- 18 gauge
FINISH: Galvanized. Some products available in Z-MAX; see Corrosion Resistance, page 6.
INSTALLATION:
- Use all specified fasteners. See General Notes.
- Not for use where (a) a horizontal cold joint exists between the slab and foundation
wall or footing beneath, unless provisions are made to transfer the load, or (b) anchors
are installed in slabs poured over foundation walls formed of concrete block.
- MASB -- First fill CMU cell with concrete grout (minimum strength of F'c = 2000 psi.)
Place MASB into the grouted cell, and adjust into position. Attach the mudsill to
anchor after the concrete cures.
- MAB -- When used in monolithic slab or stemwall construction, prior to installation,
spread the MAB legs to accommodate mudsill. Immediately after pouring and screeding,
insert into the concrete or grout. Attach the mudsill to the anchor with 10d x 1-1/2"
nails after the concrete cures. When installed in grouted concrete block or solid pour for
a center hole installation, drill a 3/4" hole through the mudsill. Wrap MAB straps
around the mudsill and install 10d x 1-1/2" nails.
CODES: BOCA, ICBO, SBCCI NER-209, NER-393, NER-443; ICBO 5357; Dade
Co., FL 97-0325.03 (MA, MAS); City of L.A. RR 25149 (MA); BOCA 97-9 (MASB).
1. Loads may not be increased for short-term loading.
2. For uplift loads, provide attachment from mudsill to building's structural
components to prevent cross-grain bending.
3. MAS installed with 1 leg attached to stud has loads of 435 Ibs (uplift), 700 Ibs
(parallel to plate) and 240 Ibs (perp. to plate).
4. MASB installed with 1 leg attached to stud has load of 960 Ibs (parallel to plate)
and 360 Ibs (perpendicular to plate).
5. MA installed attached to the stud has a perpendicular load of 670 Ibs. Parallel
loads as listed. For reduced uplift loads, contact Simpson.
