I made two big boards & I love them sooo much! I use WalMart ironing boards under them but I use the 4 leg, not the T legs. And I got the cheapest one they had too. I only keep them up when actively using them (side by side I can iron an entire quilt backing of 105" ) How thick is your board? I think I used 3/4" thick; I bet that makes a difference.