Nortrax 055101
190 David Manchester Road, Ottawa METAL STAIRS
16 May 2014 Page 1
1General
1.1RELATED WORK
.1CastinPlace Concrete
.2Masonry Procedures
.3Resilient Tile Flooring
1.2REFERENCE STANDARDS
.1Do welding work in accordance with CSA W59 unless specified otherwise.
1.3DESIGN CRITERIA
.1Design metal stair, balustrade and landing construction and connections to NBC vertical and horizontal live load requirements.
.2Detail and fabricate stairs to NAAMM Metal Stairs Manual latest edition.
1.4SHOP DRAWINGS
.1Submit shop drawings in pdf format.
.2Indicate construction details, sizes of steel sections and thickness of steel sheet.
.3Each shop drawing submitted shall bear the stamp of a qualified professional engineer registered in Province of Ontario.
2Products
2.1MATERIALS
.1Steel sections: to CAN3G40.21, Grade 300W or ASTM A36/A36M.
.2Steel plate: to CAN3G40.21, Grade 260W.
.3Steel pipe: to ASTM A53, standard weight, schedule 40, seamless black.
.4Steel tubing: to CAN3G40.21, Grade 300W, round, 3 mm (1/8") wall thickness, sizes and dimensions as indicated.
.5Grating treads: to ANSI/NAAMN A202.1, Type W194 steel with 25 mm (1") nosings.
.6Welding materials: to CSA W59.
.7Bolts: to ASTM A307.
.8High strength bolts: to ASTM A325M.
.9Shop coat primer: to CGSB 1GP-40M.
.10Plastic handrails: in profile as indicated, colour as selected by Architect.
2.2FABRICATION
.1Weld connections where possible, otherwise bolt connections. Countersink exposed fastenings, cut off bolts flush with nuts. Make exposed connections of same material, colour and finish as base material on which they occur.
.2Accurately form connections with exposed faces flush; mitres and joints tight. Make risers of equal height.
.3Grind or file exposed welds and steel sections smooth.
.4Shop fabricate stairs in sections as large and complete as practicable.
2.3GRATING STAIRS
.1Form treads and stringers from steel grating of pattern indicated, and secure to stringers with L35 x 35 x 5 supports. Form landings from steel grating of same pattern as treads, reinforced by L55 x 55 x 6 spaced at 600 mm o/c.
.2Form stringers from MC 310 x 16.
.3Form outer stringers from MC 310 x 16. with 6 mm thick plate fascia welded on.
.4Provide clip angles for fastening of furring channels, where applied finish is indicated for underside of stairs and landings.
.5Extend stringers around mid landings to form steel base.
.6Close ends of stringers where exposed.
2.4PIPE OR TUBING BALUSTRADES
.1Construct balusters and handrails from steel pipe or steel tubing as indicated.
.2Cap and weld exposed ends of balusters and handrails.
.3Terminate at abutting wall with end flange.
2.5SHOP PAINTING
.1Clean surfaces in accordance with Steel Structures Painting Council SSPCSP263.
.2Apply one coat of shop primer except interior surfaces of pans.
.3Apply two coats of primer in different colours to parts inaccessible after final assembly.
.4Use primer as prepared by manufacturer without thinning or adding admixtures. Paint on dry surfaces, free from rust, scale, grease, do not paint when temperature is below 7C (45°F).
.5Do not paint surfaces to be field welded.
3Execution
3.1INSTALLATION OF STAIRS
.1Install plumb and true in exact locations, using welded connections wherever possible to provide rigid structure. Provide anchor bolts, bolts and plates for connecting stairs to structure.
.2Hand items over for casting into concrete or building into masonry to appropriate trades together with setting templates.
.3Touch up shop primer to bolts, welds, and burned or scratched surfaces at completion of erection.
3.2INSTALLATION OF HANDRAIL
.1Make joints and mitres neat, tight and inconspicuous. Remove surplus material from joint. Provide solid return at exposed ends of handrail.
.3Clean handrails immediately prior to building hand over and final inspection.
END OF SECTION