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EXPAMET BUILDING PRODUCTS
The dry lining arch bead ref PFB001 can be curved. Steel beads modified by the plasterer are liable to produce a facetted edge.
We recommend stainless steel materials are used for external applications. However it is permissible to use galvanised Redrib ref 274 and render stop ref 570 in external applications that are assessed as sheltered or moderate exposure, away from the coast or heavily polluted atmospheres. Similar exposure restrictions apply to the use of galvanised, coated beads with PVC nosing, references 571, 572 and 573.
Stainless steel beads can only be used with gypsum based plasters if they receive an additional protective coating which must be provided by the purchaser.
Expamet offer a range of PVCu beads for both internal and external applications.
Expamet Feature Beads are available for use with plasterboard and wet plaster finishes. Engaging beads have a 20mm flange to recess into a rebate in a frame or skirting. Abutting beads have a 15mm wide channel that is positioned against the adjacent element.
Galvanised steel can be painted provided suitable preparation using a wash and etch primer is applied. Your paint supplier will advise what is compatible with their products.
Riblath ref 267 provides a carrier for render onto timber frame. It should be fixed to over a breather paper to vertical battens to provide a drained and ventilated cavity between the render and structural frame. Always space metal lathing at least 25mm off timber based sheet materials.
Expamet expanded metal lath and Riblath are only carriers for plaster and render finishes where a satisfactory bond cannot be achieved to the existing background
Structural movement joints must be taken through the metal lath and plaster finish. This type of joint should be finished with back to back stop beads with a flexible sealant in-between.
The Plaster Arch kit, a pair of pre-cast quadrants, is available in different thicknesses to suit various wall depths. Alternatively the Dry Lining Arch Bead ref PFB001 can be used to finish an arch profile created in plasterboard.
Basic dimensions are given in the sketches in the Plasterers’ Accessories brochure available as a PDF download from the LITERATURE section of this website.