If in doubt prime it has always been my way but how many would prime Moisture Resistant plasterboards ?
Now cost of primer isnt an issue but if you weigh up the time it takes to prime and drying time then that is the cost I dont like.
So how many prime plasterboards, MR or normal ?

Nope, not me

I dont prime plasterboard

This is an interesting thread. I'm new to tiling and trying to find the best and most practical tiling methods. I know that there is something in cement based adhesive that doesn't like plaster, so therefore I do prime. But I guess that if the plasterboard is intact and nicely wrapped, even more so if it is moisture resistant; then Primer it would appear, is not necessarily needed. Thanks for this thread and the experienced opinions coming out.

Depends on condition (if really dusty) or if it has been ames taped. But 9 times out of ten, I prime.

I mainly prime, but not MR boards unless there's bare edges ie external corners, then I'll prime those bits.

i do prime on nom plasterboard but not on moistureboard , but if useing powder add i would ,

Only bare edges for me

I tend to prime plasterboard as sometimes the screws expose the gypsum core or the paper surface can be torn slightly and I always use bagged addy.

Same as sweety pete.. Bare edges..

prime 9 out of ten for me too

plasterboards require priming if...

they have been up along time and are really dry.
if they are dusty or as stewart explained
or, they are in a very warm areas ie loft conversion / bathroom, laundry room

otherwise i wouldnt prime...its like all substrates, theres no black and white answer. suction control etc etc comes into play. this is where the experience bit comes in i suppose. but as said, if in doubt and you are unsure, prime for your own peace of mind,,

OK, can I ask a really really basic question about this? HOW does plasterboard hold the weight of adhesive and tiles? The paper is so thin and flimsy, I just don't get it?

Whilst I understand the need to prime exposed edges, and torn paper due to screws, can I ask why some of you prime 9 / 10, I'm assuming you mean in a domestic environment, in which case it's been d&d ?? Unless the adhesive specifies it of course.

bare edges only.......primer G here

prime it 10/10

Originally Posted by Mosaic Girl

OK, can I ask a really really basic question about this? HOW does plasterboard hold the weight of adhesive and tiles? The paper is so thin and flimsy, I just don't get it?

I think that's a good question and I don't know the answer. You wouldn't tile onto wallpaper.

Oh and I always prime...better safe than sorry.