Hi all - I've chased these pipes into a wall which is then going to be tiled, should I fill in around the pipes with mortar? The pipes have been wrapped in duct tape. Would the tiles have a hollow sound if I leave it as is? Many thanks! 

I don't think the hollow sound would be an issue but it may not work well if the tiles meet in the void.  Neat chasing!

Are you tiling directly onto the concrete block? without backerboard or anything? Wish my newly built walls were straight enough for that!!

 

If the tile edge doesn't meet over the chase, you can probably just bridge it (depending on the tile!), I'd personally probably fill it in (even if just squirty foam and then trim it flush), but I'd be putting backerboard over my walls anyway so that would hide any chases.

Fill it with sand and cement and your tilers will tile over I’m guessing a large heavy tile 

Leave it as is. Makes a 'modern' towel rail....

Thanks all. Have filled it all in

13 minutes ago, Tom said:

Thanks all. Have filled it all in

Now you’ve got to buy a towel rail 🙄🤣

...and don't drill through the pipes when mounting it.