S
Spud
prime the back of the boards before fixing them as they tend to curl up off of the adhesive if you dont prime them first , I have done what you suggested and it worked out well
Discuss Laying 80m Of Hardie Boards (concrete) in the Australia Tiling Forum area at TilersForums.com.
if it 25mm difference in height you could rescreed it using ronafix through the mixNot used to the slang these days lol
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