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a big grinder will cut a suitable deep groove depending on location stepped flashing looks better

will not each zone be fed from common return pipes & so you will learn little about the water loss if there is any

nahcartsnai if you could isolate heating runs from rest of system & pressurise it to at least 4 bar with a proper pipe tester for 10 mins at least you will know that you are going to find a leak if pressure drops if it does pump up pressure more and it may show on bare screeded sections

thanks for reply simond there is no secondary return direct cylinder on first floor seems to be heated by expansion pipe of lower indirect cylinder teed into cold feed prior to being teed in the expansion has a non return valve i assume this is to stop cold feed water mixing with hot...

carry on as you would normally do type of boiler is of no consequence just isolate from filling & power etc

doing a new ensuite which will have 2 basins loo & shower the property has an odd arrangment for hot water production & storage ground floor utility has oil boiler with rad circuits to ground & first floors swimming pool circuit & indirect cylinder circuit which is on ground...

bahco i would usually convert unused connection to cleaning eye or as you say fit coupling

marsaday sorry for some reason i pictured a kitchen worktop gotto change my brand of beer

marsaday first time seeing that combination clear is probably better choice weigh down untill cured

eddyp why dont you cut out section of sole plate take up floor board then notch top of joists to suit

calvert there is a rule forbidding it use a boss connector for bath waste as low as possible then above that bend or branch for loo

if the collar or whatever coupling external is caput bin it & fit internal connector to clay use sillicone etc on fins depending on layout you will have to decide what suits best

looked again at original posting just seen the mention of three joists was it three for price of one sorry for digressing you can still notch sole plate and set 15 pipe into notch in triple joist

are there any gate valves--stopcocks--or isolation valves on downservice pipework

sometimes non return valver make peculiar noises

ZAKEERA YOU HAVE TO THREAD CAREFULLY HERE SOME SPECIES ARE THREATNED WITH EXTINCTION AND YOU MAY HAVE TO ADOPT THEM

can you not run pipes into stud wall half dept then drill through center of sole plate & youre in floor void

do as buck 51 says if you chamfer the corners slightly much easier job

if the waste is not connected to drain but disposing over gully etc why do you need a trap ??

bertybasset i fit grohes quite a lot different types for different applications some with acess trough flush plate designed for fit & forget can highly recommend them