reno drama-need urgent advice

[reybec]

Hi we're currently in the process of renovating the bathroom.

we're putting in a shower instead of the bath/shower combination that was already there.

my problem is the position of the waste for the new shower base is going to come only about 20 mm to one side of a floor joist.

is there any way to overcome this.

i have a 50 mm space between the bottom of the waste outlet on the shower base and i have to pour a 50 mm concrete slab to bring the floor to same level as the rest of the floor (the shower is going in where we removed a cupboard from) so i'd have about a 100 mm.

is there anything that can be done or am i screwed?

any help appreciated thanks

[OBBob]

Can you partially or fully cut the joist to allow the wast to fit, then add an additional joist on either side of the one you cut?

[dazzler]

I would brace along its length and then cut as much of the joist out that is in the way, all if it has to go. Then rebrace / box around it.

:2tsup:

[namtrak]

Any photos?

But cutting and moving the joist would seem the simplest option.

Cheers

[silentC]

Had to do this once. You can put in another joist beside the one that's in the way, but it really needs to span at least bearer to bearer so that the bearers are taking the weight of the new joist. Technically, it should span at least two bearers on either side, so that it is continuous and not single span. If the distance between the new joist and the next joist opposite the one to be cut is greater than your maximum joist spacing, you'll need one either side of it.

I've seen some dodgy work done in this department, including hacking out a chunk of the joist with no reinforcement. I wouldn't recommend that. I've also seen people bolt short bits of timber to the side of the joist and then cut out a section. Personally, I'd not like to do that if it was my house.

[arms]

this should help you
http://plumbdinger.com.au/
:2tsup:

[silentC]

I thought about one of them but wasn't sure if they're suitable for use under a shower tray. On second thoughts, I don't see why not but would be worth checking with them first.

[arms]

I thought about one of them but wasn't sure if they're suitable for use under a shower tray. On second thoughts, I don't see why not but would be worth checking with them first.


and thats the only reason that i submit resolutions to this forum:2tsup:

[MrFixIt]

my problem is the position of the waste for the new shower base is going to come only about 20 mm to one side of a floor joist.

is there any way to overcome this.

IF you need to remove part (all) the thickness of the joist for access to the waste, you can use 100x50x10mm angle bolted through the remainder of the joist. Doing this will allow you to remove a sizeable chuck of joist without losing floor strength. It would be best to have the 50mm side under the joist but if that also gets in the way of the waste then having the angle the other way will still be strong. Make the length of the angle iron as long as possible, but at least 1m either side of the cut in the joist. If the cut in the joist is near a bearer then use the bearer for support.

How much of the current joist would you have to remove to allow waste installation?

[reybec]

thanks for your help everyone
i thought cutting the joist was going to be the best option


How much of the current joist would you have to remove to allow waste installation?

pretty much most of it


Had to do this once. You can put in another joist beside the one that's in the way, but it really needs to span at least bearer to bearer so that the bearers are taking the weight of the new joist. Technically, it should span at least two bearers on either side, so that it is continuous and not single span.

i can span a new joist from one bearer to another (2 metre span)
if i try to span 2 i will run into the same problem with another waste pipe which is in the way and can't access the bearers the other way without demolition work:((

would spanning 2 metres between 2 bearers be sufficient and would the new joist necessarily have to be hardwood like the rest of them?


this should help you
http://plumbdinger.com.au/
:2tsup:

i'm liking the idea of this one

can it be used under a timber floor?

[arms]

i'm liking the idea of this one

can it be used under a timber floor?[/quote]

i use them when ever i have problems with bathroom renovations ,they are great and lets face it they are only adjustable position pvc fittings and will last as long as ridged piping will :2tsup:

[OBBob]

I'd use hardwood ... especially under a wet area.

In terms of the span ... just cut the existing joist and add a new one on each side. Then you have doubled up, which will resolve your single span issue.

[reybec]

had another look and was able to solve the problem using two 45 degree elbows and a piece of pipe :2tsup:

i only had to move the actual hole about 20 mm