This base kit is made up of the following items:
Recycled plastic posts (which will not rot and also form a damp proof course) which are concreted into the ground with postmix readymixed concrete (also supplied in bags) at approximately 2m spacings around the perimeter and half way along each internal joist (if more than 3m span).
A big advantage is that you do not have to level the ground as you would with a concrete base because you simply use longer posts where the ground level drops away.
We are able to provide a CAD drawing for each base if you intend to install this item yourself.
Method of construction of the raised timber base
47x150mm tanalised timbers are fixed together to form the ring beam around the outer edge, which is then chocked up to be level and square (just above ground level, giving under floor ventilation and to avoid damp transferring to the timber part of the basekit) to form an outer ring beam for the main cabin walls to bear on. This then dictates where the corner posts are to be concreted into the ground. Once the corner holes are dug, the plastic posts can then be offered into the holes, cut off to the correct length (the posts are supplied in long lengths to give flexibility for the lengths required), bolted to each of the timbers it is in contact with (lengths of threaded rod, nuts and washers are supplied with our kits) and concreted in using the quick setting postmix which is also supplied with our kits. Further intermediate plastic posts are then fixed onto the outer ring beam in the same manner as the corner posts at no more than 2m spacings.
The position of the internal joists can then be marked around the outer ring beam timbers. Joist hangers (supplied with the kit) are then fixed according to the marking out and the internal joists fixed into the joist hangers. If the span of the internal joists is greater than 3m then intermediate plastic posts are required which are are bolted to the joists in the same manner as the outer ring beam.
It is also possible that more materials may be required once the groundworks have started (there may be soft ground or tree roots where posts have to be moved in order to span across them or if heavy equipment is to be installed where an extra post may be required for extra support, etc.), this is impossible to allow for before this point but can be supplied very quickly to avoid delays. It is the customers responsibility to ensure that reasonable precautions have been taken if potential problems are known beforehand (ie if heavy loads are to be put onto the base especially if they are concentrated in one area, built up ground, hard ground in the summer which becomes soft ground in the winter due to rising water tables, etc), in order to alleviate any future problems (ie subsidence). It is not possible to guarantee the stability of the base unless a ground survey has been carried out and structural calculations have been made by a qualified structural engineer.
This forms a very sturdy base onto which the cabins can be built directly, giving major time advantages over the more traditional concrete bases.
If the building is greater than 30 sq m internal floor area, then building regulations will apply. We are able to upgrade the raised timber base to comply with building regulations at extra cost - this cost can not be determined until calculations have been made by a structural engineer (at extra cost) and also inspections have been made by a local council building control officer once the work has commenced, who will determine the depth of holes required for the posts which is subject to site/soil conditions.
Price shown is per square metre covered.
This product was Last Modified on Sunday 17 March, 2013.