BLOCKAID BAR CHAIRS
HOW TO ESTIMATE FOR BLOCKAID BAR CHAIRS IN A JOB
Blockaid Bar Chairs are placed at every intersection of the horizontal and vertical reinforcing steel in a masonry block wall. This equates to 7 Blockaids per square metre of wall, based on the vertical steel being placed at 400mm centres and allowing for using Blockaid to correctly align any control joint dowels.
The trade price of Blockaid (BACL190 & BANCL190) from OneSteel is $0.90 each, so Blockaid costs $6.30 per square metre. Given the cost to fully construct a masonry block wall is in the order of $160 per square metre (blocks, steel, concrete, labour), Blockaid increases the cost of masonry wall construction by less than 4%.
However, the use of Blockaid Bar Chairs to locate the reinforcing steel generates a time saving of approximately 5%, based on a time and motion study conducted by Newcastle Innovation (University of Newcastle). Therefore using Blockaid may often be cost neutral and the value of knowing that the steel placement will always pass inspection…… is priceless!