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How to build 4000mm x 1800mm x 340mm theatre riser platform with inbuilt steps on each corner?
Welcome to the Bunnings Workshop community @Sergej. It's wonderful to have you join us, and many thanks for your question about constructing a stage platform.
There are numerous ways you could go about building this platform. One of the most cost-effective would be to use 90 x 45mm Framing MGP10 H2 Blue Pine and 1800 x 600mm 19mm Flooring Particleboard Yellow Tongue. I've created some renderings below that provide an example of a relatively simple structure. I've used a joist over bearer system as the 180mm frame height puts us in the ballpark of your 340mm desired height. I suggest using Builders Edge 70 - 170mm Bigfoot Xl Pedestal Feet to make up the additional 160mm height. This will actually be 141mm once you minus the particle board top. The pedestal feet will make it super simple to level the structure. Alternatively, you could cut sections of the 90 x 45mm timber at the same length and use them to raise the structure.
The main reason for using the 90 x 45 double layer frame is that if you were to build the structure with, say, 240 x 45mm Framing MGP10 Untreated Pine, not only would it be substantially more expensive, but you'd still need to raise the frame to make up for the difference between your 240mm timber and the 340mm desired height.
Take a look at the renderings below and let me know what you think. As mentioned, this is just one of the many ways you could create the frame.
Please let me know if you have any questions.
Mitchell
Welcome to the Bunnings Workshop community @tarun1arora. It's brilliant to have you join us, and many thanks for your question about using treated Pine indoors.
I'm of the understanding that H3-treated timber can be used indoors, as I believe it's only CCA-treated H4 timber that has restrictions on its use. You might want to paint the timber just to be on the safe side. The manufacturer of the H3-treated timber would be the ultimate source of information on where their product can be used. Our team in-store can contact the supplier in your area and determine the suitability of this timber for your project. Or, if you can link me to the specific timber you'd like to use, I can contact the supplier for you after the weekend.
Typically, you'd space these joists 450mm apart and support them every 1200-1500mm.
Please let me know if you have any questions.
Mitchell
Welcome to the Bunnings Workshop community @DrKMcB. It's wonderful to have you join us, and many thanks for your question about removing a riser.
You might like to post some images so our members have a better idea of what you're working with. Let me know if you need assistance uploading images.
Your best bet would be to consider how it was assembled. The first step would be pulling up coverings like the carpet. Here's a helpful step-by-step guide: How to remove carpet. Once the structure is exposed, you must determine how the flooring panels were attached to the frame. Hopefully, there are screws which you can undo that will release the panels. When the panels are off, you'll begin disassembling the frame.
Depending on when the riser was installed, be prepared that the flooring under it might not match the rest of the room.
Please let me know if you have any questions.
Mitchell
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