Holes in the Floor..Not sure where 2 put this

[Ivan in Oz]

G'Day Ppl,

Hopefully next week my Shed Slab will go down.
In it I'd like to have Laundry, Toilet and Shower.
The Drainage for them is sorted together with the mandatory Floor waste
as is the Electrical Conduit...40mm

Should I put in anything else into the slab.......?

Thinking along the lines of Floor waste for Dust extraction or
what ever I might need,

To late once the Concrete is down

[glock40sw]

G'day.
I ran copper pipe for air lines in my slab.

I worked out where the compressor would go and where I wanted the outlets. When the plumber came to hookup the dunny and water, he also extended the copper line up the walls. Once everything was placed, He came back and did the final hookup for the air outlets.

I figured that the more I could get under the shed made it easier than running it around the walls.

[journeyman Mick]

Just make sure you use lagged copper if embedding in concrete, with any stripped sections of lagging replaced and generously taped with duct tape. I've seen scores of houses that have had in-slab piping replaced when it failed after a number of years. The copper expands and contracts with temperature changes much more than the concrete does and basically "chafes" against the surrounding concrete.

Mick

[Pusser]

You might consider laying a few blank 2" plastic pipes underneath the slab so when you need to install a watering sysem, external lights, external power points or indeed run anything else under the shed you have an easy path to do it etc you have an easy way to do it. I did it for a driveway once ended up running wires for watering system, control wires and security wiring through them. Had no idea what I would use them for at the time but having had to tunnel under a slab once I had no intention of ever doing it again.

[addo]

Yep, digging down beside a slab or footing and then boring in, really can suck.

I'd allows for comms - like an internet or phone cable; the alarm could probably share a conduit with it.

Also, with underslab copper - besides the lagging - go up a size. It allows for unintended crushing of the pipe, or if it's a long run from the main source to the point of use, the whole run can then be sized up to ensure no restrictions to full flow. I've seen this point ignored - under a $10K polished slab. (Hey, I was just an apprentice, but the fight when the cause was revealed, was spectacular.)

Another classic screwup is inadequate offset for the toilet pan. It means the cistern is too far forward and the lid never stays up! Check it one more time against the internal wall position and the suite dimensions/specs.

Cheers, Adam.