5.6 Exceptions to Material Requirements

ANSI/AWI SMA 0643-2021 - Wood Stair, Handrail, and Guard Systems

a) The following are subject to the requirements of 3.2 Material unless otherwise indicated in the tables below: Alder (Red), Anigre, Ash (White), Basswood, Beech (American), Beech (European), Birch (Yellow – ), Birch (Yellow – red), Birch (Yellow – select white), Cedar (Western Red), Cherry (American Black), Fir (Douglas – flat ), Fir (Douglas – ), Hickory (True Group), Mahogany (African – plain sawn), Mahogany (African – quarter sawn), Mahogany (American), Makore, Maple (Hard – natural), Maple (Hard – select white), Maple (Soft – natural), Oak (English Brown), Oak (Red – plain sawn), Oak (Red – rift sawn), Oak (Red – quarter sawn), Oak (White – plain sawn), Oak (White – rift sawn), Oak (White – quarter sawn), Pecan Group (Hickory), Pine (Eastern or Northern White), Pine (Ponderosa), Pine (Southern Yellow), Pine (Sugar), Poplar (Yellow), Redwood (flat grain ), Redwood (vertical grain heartwood), Teak, Jatoba, Sapele, and Walnut (American Black).

WOOD SPECIES	EXPOSED STRINGERS & S
	Maximum Number of Staves Per 12″ Width
	Premium	Custom	Economy
Cherry, American Black	4	S	S
Oak, English Brown	4	S	S
Oak, Red – rift sawn	4	S	S
Oak, Red – quarter sawn	4	S	S
Oak, White – rift sawn	4	S	S
Oak, White – quarter sawn	4	S	S
Pecan Group, Hickory	4	S	S
Walnut, American Black	4	S	S
*S – No exception is applicable. Requirements set forth in ANSI/AWI SMA 0643 – Wood Stair, , and Guard Systems (latest edition) shall apply

WOOD SPECIES	EXPOSED S AND SKIRT BOARDS
	Number of Linear Splices in Staves up to 14’			Minimum Length of Stave Where One-Piece Stave is Required
	Premium	Custom	Economy	Minimum Length of Stave Where One-Piece Stave is Required
Alder, Red	1	1	Unlimited	10’
Anigre	1	1	Unlimited	12’
Ash, White	1	1	Unlimited	12’
Basswood	1	1	Unlimited	10’
Beech, American	1	1	Unlimited	12’
Beech, European	0	0	Unlimited	15’-6”
Birch, Yellow – natural	1	1	Unlimited	12’
Birch, Yellow – select red	1	1	Unlimited	11’
Birch, Yellow – select white	1	1	Unlimited	11’
Cedar, Western Red	0	0	Unlimited	15’-6”
Cherry, American Black	1	2	Unlimited	7’
Fir, Douglas – flat grain	0	0	Unlimited	15’-6”
Fir, Douglas – vertical grain	0	0	Unlimited	15’-6”
Hickory, True Group	1	1	Unlimited	12’
Mahogany, African – plain sawn	0	0	Unlimited	15’
Mahogany, African – quarter sawn	0	0	Unlimited	15’

WOOD SPECIES	RISER
	Number of Staves Per 7.75″ Height
	Premium	Custom	Economy
Oak, English Brown	3	3	S
Walnut, American Black	3	3	S
*S – No exception is applicable. Requirements set forth in ANSI/AWI SMA 0643 – Wood Stair, Handrail, and Guard Systems (latest edition) shall apply

WOOD SPECIES
	Maximum Number of Staves Per 12” Depth
	Premium	Custom	Economy
Oak, Red – rift sawn	4	5	S
Oak, Red – quarter sawn	4	5	S
Oak, White – plain sawn	S	S	S
Oak, White – rift sawn	4	5	S
Oak, White – quarter sawn	4	5	S
Teak	4	5	S
Walnut, American Black	S	5	S
*S – No exception is applicable. Requirements set forth in ANSI/AWI SMA 0643 – Wood Stair, Handrail, and Guard Systems (latest edition) shall apply

WOOD SPECIES	RAIL
	Minimum Length of Rail where Solid Top Cap is Required
	Premium	Custom	Economy
Alder, Red	10′	8′	S
Anigre	12′	10′	S
Ash, White	12′	10′	S
Basswood	12′	10′	S
Beech, American	12′	10′	S
Beech, European	15′-6″	14′	S
Birch, Yellow – natural	12′	10′	S
Birch, Yellow – select red	11′	10′	S
Birch, Yellow – select white	11′	10′	S
Cedar, Western Red	15′-6″	14′	S
Cherry, American Black	8′	6′	4′
Hickory, True Group	12′	10′	8′
Makore	12′	10′	8′
Oak, English Brown	8′	6′	4′
Oak, Red – rift sawn	10′	8′	4′
Oak, Red – quarter sawn	10′	8′	4′
Oak, White – rift sawn	10′	8′	S
Oak, White – quarter sawn	10′	8′	S
Teak	10′	8′	4′
Walnut, American Black	8′	6′	4′
*S – No exception is applicable. Requirements set forth in ANSI/AWI SMA 0643 – Wood Stair, Handrail, and Guard Systems (latest edition) shall apply

WOOD SPECIES	RAIL
	Maximum Permitted Joints in Top Rail Per 15’-6” Length Ply of
	Premium	Custom	Economy
Alder, Red	1	1	S
Anigre	1	1	S
Ash, White	0	1	S
Basswood	0	1	S
Beech, American	0	1	S
Beech, European	0	1	S
Birch, Yellow – natural	0	0	S
Birch, Yellow – select red	0	0	S
Birch, Yellow – select white	0	0	S
Cedar, Western Red	0	0	S
Cherry, American Black	1	1	S
Fir, Douglas – flat grain	0	0	S
Fir, Douglas – vertical grain	0	0	S
Hickory, True Group	1	1	S
Mahogany, African – plain sawn	0	1	S
Mahogany, African – quarter sawn	0	1	S
Mahogany, American	0	0	S
Makore	1	2	S
Maple, Hard – natural	0	1	S
Maple, Hard – select white	0	1	S
Maple, Soft – natural	0	1	S
Oak, English Brown	1	1	S
Oak, Red – plain sawn	0	1	S
Oak, Red – rift sawn	1	1	S
Oak, Red – quarter sawn	1	1	S
Oak, White – plain sawn	0	1	S
Oak, White – rift sawn	1	2	S
Oak, White – quarter sawn	1	2	S
Pecan Group, Hickory	1	2	S
Pine, Eastern or Northern White	0	1	S
Pine, Ponderosa	0	1	S
Pine, Southern Yellow	0	1	S
Pine, Sugar	0	1	S
Poplar, Yellow	0	1	S
Redwood, flat grain heartwood	0	0	S
Redwood, vert. grain heartwood	0	0	S
Teak	0	1	S
Jatoba	S	S	S
Sapele	S	S	S
Walnut, American Black	1	2	S
*S – No exception is applicable. Requirements set forth in ANSI/AWI SMA 0643 – Wood Stair, Handrail, and Guard Systems (latest edition) shall apply

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ANSI/AWI SMA 0643-2021 - Wood Stair, Handrail, and Guard Systems

5.6 Exceptions to Material Requirements

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