You should be ok if you use the correct spacings
15mm is 1.2m horizontally 1.8 vertical
22mm is 1.8m horizontally 2.4m vertical
If notching joists under floor wrap some hair felt round the pipes
Thanks, I'm already using hair felt in notched joists, this is running along between the joists on a 6m run, so plenty of expansion. We have full access as the ceilings underneath are down so I can clip at correct intervals if that is then going to be creak free.
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local