Installing, Priming and Sealing of Bead – Procedure. N.B. Use only UV stabilized beads for external application.
At this point particular care needs to be exercised to ensure that the installation of all beading around window, door openings etc.; it is imperative that this procedure is performed correctly. This is not just a gap filling exercise but an integral part of the total NRG Greenboard Walling System.
• External and internal ‘rail edges’ must be precise to ensure a uniform complete ‘fit and finish’ in readiness for sealing as well as rendering.
• Extra care needs to be taken to make sure all ‘beads’ are both ‘plumb/level’.
• Priming (to prevent ‘roll-back’ of sealant) and sealing procedure stage requires extreme attention to detail to ensure water tightness of all windows, doors and openings.
• Using Bostik Primer 5077, and a clean rag, dampen cloth with primer and quickly clean the internal joinery to NRG line that is to be sealed.
• Using masking tape, accurately adhere to frame of joinery, 4mm form edge creating a neat parallel margin, ready for sealant application.
• Cut a medium size end off nozzle of ‘Seal’n Flex.’ Proceed in applying sealant. Using a coving tool, neatly create an internal cove finish.
• Remove masking tape from joinery leaving a 100% water proof joint seal.
I. External Corner Angles Beads – External Points of the building, columns etc.
a) Install external corner angle bead to external corner edges by applying a ‘liberal’ bead of
Bostik ‘No More Nails’ to both sides of internal corner rails of the external corner angle bead, then press bead firmly into position. Make sure it is plumb, scraping of excess glue protruding through bead perforations (priming of beads in this case is not required).
II. External Corner Beads – Render return to windows and doors – head, jamb and sills. This is particularly recommended for 60mm, 75mm and 100mm Greenboard.
a) Allow 3mm gap between Greenboard panel and openings (this will provide a ‘key’ for the sealant). Tape around window and door perimeters.
b) Prime and tape around aluminum surfaces of window and door component edges prior to rendering, apply a bead of sealant into the ‘gap’ between the Greenboard and the component edge. This sealing process is repeated after rendering and prior to the
texture painting system
c) Install external corner angle bead to external corner edges. Refer I. a) above.
III. Reveal Beads/Render Reveal Trims (sill) return to head, jamb and sills of windows and doors.
a) Allow 3mm gap between Greenboard panel and openings (this will provide a ‘key’ for the
sealant). Tape around window and door perimeters, priming both surfaces.
b) Prime (using Bostik Primer 5077) beads and tape around surfaces of windows and doors in readiness for application of the texture painting system.
IV. Render Reveal Trim (Sill) – 40mm
a) Allow 3mm gap, prime beads and tape around surfaces of window and door edges prior to sealing readiness for application of the texture paint system.
V. Expansion Joint – there are two options available – Either by using Reveal Beads or Render Expansion Joint.
1) Reveal Beads
a) Install ‘reveal bead’ to both edges of Greenboard by applying a ‘liberal’ bead of Bostik ‘No More Nail’, allowing a 6mm gap between both sheets, then insert a 10mm foam
backing rod as shown.
b) Prime (using Bostik Primer 5077) both top and bottom outside exposed edges before applying sealant thus creating an ‘expressed’ joint as shown.
2) Expansion Joint Bead (illustration shown in Accessories)
a) Install ‘render expansion joint’ between both Greenboard surfaces (leaving required gap). Applying two beads of Bostik ‘No More Nail’ to either side of the internal corner rails (i.e. top and bottom sections), with sufficient glue to allow the glue to penetrate perforated rail edges. Scrape off excess.
b) Prime (using Bostik Primer 5077) within the ‘flexible’ joint, before applying the sealant thus creating an ‘expressed’ joint.
