I recently had a patio installed and want to complete the feature with a 5.4mx3.8m deck.
There is an existing 3.3mx3.3m ~100mm thick slab as shown which is about 1/2 of the deck area to be built over.
Clearance from the slab to proposed deck floor level is 100mm (at the door) to the internal floor tile level
For the remainder of the area is a clay "soil"
My questions here are can I build a deck on top of the existing slab with only 100mm clearance?
Is there a minimum size for joist requirements ?
Will I need to dig out the non slab area to a certain depth ?
The Deck will extend out to the gutter on the sliding door side beyond the existing slab
Looks like it will be a great area to enjoy the warmer weather. I'm sure Workshop members will be happy to assist with your decking project. If you search for low level deck here on Workshop you might find other projects of interest from other members as it's a popular topic.
Welcome to Workshop. We're pleased to have you join us and look forward to seeing how this project (and many others to come in the future) progress to completion. Feel free to post anytime you need assistance or have something to share.
Great patio. This is a future project I want to look at for my home Reno if budget allows.
Could I ask what the patio set you back? Did you have to go through council?
Was it an off the shelf type patio, like the ones at stratco, or custom built?
Are you installing a timber or composite deck? I ask because they have different clearance requirements. Timber should have 300mm to allow sufficient airflow and help keep the timber as dry as possible. Composite you can get away with the 100mm in that slab area without any issues.
Joists should be a minimum of 120x45 H3 generally speaking. So, I'd be installing 90x45 H3 timber for the framing above the slab, then move to 140x45 (bearers) and 120x45 (joists) for the remaining without slab. The frame would be supported by 100x100 H4 stumps at least 300mm deep.
Hope this helps - happy to help some more if you like.
Welcome to Workshop. We're really pleased you could join us and look forward to seeing your deck project come to life.
I'd also suggest you start a new discussion and share some photos from a few different angles of your area so members can get a better idea of what you are working with. We have an amazing community of clever and creative people sharing advice and inspiration every day, so I'm sure they would be happy to help as much as possible.
Thanks for joining in the discussion,
Thank You for messaging me back...
Andrew and I are keen on ideas to get started on planning the upgrade of our area out the back..
Seeing other peoples projects is a huge help- although we are now coming up with other ideas and changing our minds often.. Quite fun and exciting actually..
Andrew will measure up and take photos of area over this weekend for me to upload here..
Looking forward to more ideas and comments.
Couple of comments from a untrained handyman--I was going to say jerry builder but I use good materials & overengineer
In summary: while your project won't be as quick or as easy for the chippies for the Backyard makeover most things are possible with planning/research followed up with blood, sweat, tears, & patience! Happy to provide info.