Base Construction for Teahouses & Bridges
Our buildings are substantial structures that need to be sited on a uniform level base. It will need to be square (ie equal diagonals) to ensure the roof sits squarely. We can supply floors and decks and these include the underlying joists but NOT any substructure below this.
Open sided buildings sit on decks and are fastened to the deck via base plates, which need good support under the corner posts to ensure that the coach screws used to secure them are effective. If we are NOT supplying a floor then the enclosed building require a perimeter wall plate, 100mm (4") wide to support the posts and walls. The flooring boards can then butt up to the walls internally. This will enable a damp proof course to be laid between the floorboards, under the wall panels and turned down over the wall plate on the outside to ensure a weatherproof seal.
The base may be a concrete raft with a 100x50mm (4"x2") wall plate laid horizontally or for lighter open structures a row of concrete blocks can be laid at the front and back with intermediate rows at 1.2m centres. The blocks should be laid on a foundation of hardcore and concrete.
The size of the base should be at least 200mm (width of 2 posts) greater than the dimensions quoted for the building (distances between posts). This is the wall plate size and the wall panels are fitted to the outside of the post and hence wall plate. The roof will overhang the walls by a further 200mm on all sides and a little more at the corners. As the buildings do not normally have gutters, the runoff should be to a surface that will not splash back on to the walls (to prevent muddy walls) and will be freely draining. A gravel surface and planting is ideal. If you have a veranda in front of the building it is recommended that a gutter be fitted over the door area. We can supply half bamboo gutters with simple wooden gutter brackets that can be fixed to the underside of the rafters.
The range of Jade bridges are all supplied with a pad upon which the bridge sits at each end. The pad consists of two lengths of decking joined by 50mm (2") fillets of treated timber. The pads are bolted down onto a secure base at each end and the bridge is screwed to the pads. The pads are 300mm or 400mm in length and 800mm in width (internal, 950mm external) unless you have a non standard width. The pads extend from the each end of the bridge. A 2.4m bridge will have 1.8m between the pads and will span a gap of a little less than that (about 1.5m - this allows for crumbling pond edges or rising over small edges). The pads should enable a firm fixing to be made and will take the weight of the entire bridge and passengers. It may be of concrete or even good condition railway sleepers or other substantial treated timber section.