fill hole around pipe

hello all, 
I am adding a new extractor fan to the kitchen and looking for some help on filling around the pipe. the instructors say to mortar it in but not a 100% sure how to do that. I have manage to fill the gap on the other side but that was a bigger hole. 
any tips or recommendions would be great. here is a photo to show the gap around pipe, the gap is about 2.9cm give or take

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  • tacpot12tacpot12 Forumite
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    I normally fill the gap with expanding foam, then remove about 25mm from around the two outside faces and fill with mortar.
    The comments I post are my personal opinion. While I try to check everything is correct before posting, I can and do make mistakes, so always try to check official information sources before relying on my posts.
  • BrowntoaBrowntoa Forumite, Board Guide
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    As above ....
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  • Mickey666Mickey666 Forumite
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    . . . Or rockwool-type insulation, or newspaper.  I’ve discovered both during renovations.  Builders seem to use whatever they have to hand.  As above, it’s only the final inch or so that gives the cosmetic finish.
  • grumblergrumbler Forumite
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    IreneMot said:
    the instructors say to mortar it in but not a 100% sure how to do that.
    What are you going to do with mortar then? If it'll be covered with some decorative plate or even tiled over, then just expanding foam is fine without any mortar.

    We are born naked, wet and hungry...Then things get worse. :(

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  • IreneMotIreneMot Forumite
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    thank you for help everyone and I have just put some foam into the gap today and all is good just waiting for it to set. 
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