The Brew Cabin

i require a recess tray for a square waste drain.The internal measurements are 600mm by 760mm,can only find 600mm by 600mm.Have yet to see recess tray in the flesh and suspect i could be measuring wrong.
Back to the tray i suspect the internal area is 600mm by 600mm but the overall length including the lip should take me upto 760mm?

Help

You can 'corbel' the opening, ie, reduce it in size, so that a standard 600x600mm recess tray is suitable as a cover. This can be done with bricks (engineering type), or with hyrdaulically pressed concrete flags/edging kerbs, with steel lintels or similar.

However, you can get different sizes of trays, from specialist suppliers, but you will pay quite a premium for them. If poss, it's always cheaper to stick with a 600x600 than to hunt down and fork out 120+ quid for a 600x750mm tray.

Are you ok on the principle of corbelling, or do you need me to explain it further?

corbel????

There's a diagram on the Recess Trays page showing the priinciple of corbelling - about three-quarters of the way down the page.

If I get the time later on, I'll see if I can come up with a better drawing, but for now, the basic premise is that each successive course of bricks projects out a little bit more, gradually reducing the opening to the required width.

You can use hydraulically pressed flags or edging kerbs, in place of the bricks, if you prefer.