229AR / 298 Alumin-R Metal Roofing System
PREPARATION AND APPLICATION GUIDELINES
1. All fasteners should be re-tightened or replaced as necessary. Stripped fasteners must be replaced with larger fasteners. All fasteners must include a neoprene washer.
2. The roof should be power washed maintaining a minimum of 3000 PSI of working pressure. This should remove dirt, dust, waste products, i.e. grease, animal fats, solvents, loose roofing products and any air borne pollutants.
3. Rusted through panels or sections must be replaced.
4. Heavily rusted areas must be wired brushed down to clean, stable metal.
5. All horizontal seams must be treated in the following manner using Karnak Metal Seam Sealing Tape:
A.) Peal back the release sheet and apply Karnak Metal Seam Sealing Tape exactly to the horizontal seam. Try not to remove as this may damage the seam sealing tape. Do not stretch.
B.) Press down firmly starting at the center and working towards the outside edge, removing bubbles. Slight wrinkling should not affect the perfomance fo the seal. Edges msut be free of fishmouths, uplifts and tunnels.
C.) Press firmly where tape goes over any fasteners.
D.) Finish seam by applying 229AR-Elastomeric Trowel Grade over the taped seam. Apply 229AR Trowel Grade with a 3" brush cut halfway down to stiffen bristles. Apply at an average thickness of 1/16" to completely cover the polyester face of the tape and feather out.
6. All vertical seams, if tight, should only receive a 2" wide application of 229AR Elastomeric Trowel Grade. If seams are open, follow treatment for horizontal seams as described above.
7. Any fasteners in the field of the roof not alresdy protected as part of a seam detail must receive a dollop (swirl coat) of 229AR Trowel Grade to completely enclose the fastener.
8. All protrusions and curbs should be flashed with Metal Seam Sealing Tape and 229AR-Elastomeric, following good roofing practices and industry standards. Metal Seam Sealing Tape and 229AR may be overlapped by 1" for addressing wider repairs. Allow all repairs to cure for 24-48 hours.
9. Finally, apply 298 Alumin-R at a rate of 1.5 - 2 gallons per 100 square feet to the entire roof.
Note: Field measurements are essential due to the fact that actual square footage of corrugated roofs are more than flat conventional roofs. There could be as much as a 15% - 20% difference in square footage.