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Masonry Anchor Bolts - Masonry anchors work by expanding against the sides of the hole and gripping the concrete. The holding power of any anchor depends on the quality of the concrete and on where the anchor is placed. If the concrete is old and crumbly, the holding power of the fastener will be reduced.
Likewise, if the anchor is placed near the edge of the concrete-or two anchors are placed too close together-the force generated by the anchor may break the concrete. The general recommendation is that any anchor should be placed no closer than five diameters from the edge of the concrete. In other words, a 1/2" diameter anchor should be no closer than 2-1/2" (1/2" x 5) from the edge of the concrete.
Two anchors should never be placed closer than 10 diameters from each other. In other words, two 1/2" anchors should be at least 5" (1/2" x 10) apart.
Please contact sales@scfsupplies.co.uk if you require any further information.
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