How to build a concrete pad with 2 sides against existing sheds?

[Char1991]

Hello

I am installing a DIY concrete pad for a horse washbay that will be 7 x 4m. 

I am getting the concrete delivered to save my back a bit but will be doing the rest myself. I have researched and learnt about the formwork, reo mesh, reo chairs etc. 

However, my question is, as 2 sides are against existing sheds, i assume i don't do any formwork on those sides as the sheds themselves essentially form it. Is there anything i should spray on the colorbond of the sheds to protect against the concrete or anything? It is just a tack shed and a storage shed as per drawing (not to scale).

Thanks

[EricL]

Hello @Char1991 

Thanks for sharing your question about your concrete pad installation. For total protection of the shed, I suggest building form work right up against it. In this manner the concrete won't even be touching the shed. Another option is to paint the bottom of the shed with Gripset Betta 1L Waterproofing Membrane Bitumen Rubber. The membrane will protect the shed from any corrosive effect the concrete may have on steel.

My best advice is to make sure that the pad has a slope in it to prevent water from pooling on the surface, always provide a drain or run off for the water and make sure to cover the surface with plastic to slow down the drying time of the concrete. This will prevent the surface from splitting or cracking.

If you need further assistance, please let us know.

Eric