Decking subframe

Joined
13 Nov 2006
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Kent
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I've been asked to replace the decking in my neighbours property, there was a softwood decking in situ but I ripped that out as it was dangerous, I didn't want my 91 year old neighbour having an accident.

I hoping to discuss the design for the sub base as its elevated. The length is 10.5mtrs long x 2.4mtrs wide. At the left handside it will 1000mm high from the grass and on the right 200mm high from the grass, the difference being the elevation of the garden.

I'm going to bolt a 5x2 plate to the house for 10.5mtrs , off of that I'll hang 5x2 joists which will connect via hangers to an 8x2 Double at running parralel to the house for 10.5 mtrs giving me a total sub base width of 2.4mtrs.

I'm thinking 100x100 posts postcreted into the ground to sit the 8x2 double on and then using 150x150x 100mm Galvanised angle brackets to connect the posts to the double, I'm thinking 1000mm centers for the posts but.....this is my sticking point, I'm not sure if 1000mm centers will distribute the load properly??

The deck is solid composite with composite balustrades around the perimeter.
 

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