Post by Scootter » Thu Apr 29, 2010 11:40 am
.MickBee wrote:Update: I emailed to Lafarge
" .. although the mortar has set firmly as a mortar layer underneath the slabs, it has not adhered to the slabs - there is a sandy layer on top of the mortar. Suggestions, please, for re-laying the slabs so that they stick to the mortar layer?
"
and had the following reply:
"From what you state, it seems likely that the slab has sucked the moisture from the Slablayer, thus preventing the cement hydration and bond strength gain. To prevent this, either damp the slabs down a little prior to placement or wet the slabs thorughly a few hours after placement. An external PVA would solve this problem and guarantee a good bond, especially if there is little mechanical key on the underside of the slab."
I followed both suggestions; watering the slabs AND coating them with exterior PVA (not woodworking glue) before laying them - and it worked.
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