Back Bolt Type Specifications
Natural stones are diverse and irregular. Each of which has its own characteristics and optimum size. PFM will achieve the effect you want. Providing a safe, artistic facade; dry hanging solution proposal and budget friendly. PFM suggests that you use the following sizes for preliminary design ：120x60x2.5cm（48″x24″x1″），60x60x2.5cm (24″x24″x1″ ) ，60x30x2.5cm (24″x12″x1″ ). Using the optimum size is to shorten the construction period, save costs, and improve safety.
Specification of Aluminum Alloy
The structure is made up of profiles and brackets manufactured via the extrusion of aluminium alloy, with a minimum thickness of 2 mm.
The structure will be tied to the support in order to absorb thermal expansion/shrinkage and subsidence of the support itself so that the external covering is not affected by any possible future induced stress.
The safety of the system must be guaranteed via a subsequent check for every single project; in accordance with the norms relating to wind pressure/depression.
Specific Description of Back Bolt System
The fixing of the stirrups to the support of the bottom will have to be realized by means of dowels appropriate dimension and adapted to the specific type of the support. The mounting of the uprights on the stirrups will be done by means of rivets, with “fixed point” and “sliding point”, according to the executive project.
The rising profiles will be successively fixed in place with the horizontal profiles drilled and shaped so that the stresses due to the action of the wind doesn’t stress the clips.
This system provides forward facing slabs. Which consist of a mechanical machining. performed on the back of the slab and the successive insertion of steel clips.
This preparation has been specifically designed for anchoring clips that will then be hooked to the horizontal profile.
Back bolt stone curtain Advantages
Back bolt dry hanging Installation Process