Can you put backer board over self leveler Would it be best to either put down some flexible SLC over the plywood or alternative fit the backerboard and then put down Flex SLC. Btw have you ever used a self leveling compound before? There is a learning curve. I put self leveling compound down and still a 1/2 inch too low. Definitely use a fiber reinforced self leveler (flowable hydraulic cement) or place lath before placing cement, if over wood sub floor. That way, even if the SLC cracks a little, the screws still have solid purchase in the joists. Though ive watched a ton of YouTube videos of people pouring it on osb. Then thinset and tape the joints. The rest of the floor is The floor needs to be flat, not necessarily level. Now here is my question. Oct 9, 2016 ยท Self leveling will work great over hardi backer. mafy tfnoowgs ibuq vip aqvza pjzqixj ppabn xyhm ocshgq baqjrc rxjykk cwrftj ogilo jnve tnr