The NA and NP range of adhesive fix control joints are designed primarily for incorporation into structures which are being refurbished, where the major movement cycles of settlement and drying shrinkage have already occurred and where a new slab, screed or bed is not being laid. These joints provide compression only stress relief from the movement effects of thermal change and imposed or transient loading (traffic) in floors and walls.

Ti-Lock-NA and NP joints are installed directly into the adhesive bed used to affix the tiles, and joint footplates are perforated to allow a firm key into the fixing agent. It is important that careful consideration is given to the depth of tile and proposed depth of adhesive layer prior to specifying and ordering this product. Simply, tile depth plus adhesive depth must closely approximate joint depth
otherwise the top of the joint will not be flush with the top of tiles.

It is also important that the joint should be bedded on a layer of adhesive and as such at least 1mm should be allowed in respect of this, and therefore:

tile depth + bed depth - 1mm = joint
depth.

Ti-Lock-NA and NP joints are supplied in 2 metre lengths and are available with Brass, Aluminium or Stainless Steel side plates bonded to a Neoprene or *Vamac core. Standard core colours are Black, Grey and Stone (beige). Special colours and sizes can be manufactured to order.

*Vamac joints have been specifically designed for projects where a high degree of fire resistance and low toxic smoke emission is required. Such installations include underground rail terminals, basement levels of air terminals, hospitals and other areas where personnel (or passengers) work (or transit)
below ground level.

Vexcolt's *Vamac synthetic rubber extrusions have been tested and approved to the latest London Underground Limited Engineering Standard E1042:A4 September 2000
'Engineering Standard for the fire safety performance of materials used underground'