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Merronbrook

timber frame manufacturers, easi-joist Merronbrook

Easi – Joist Span Tables

The following Easi – Joist span tables are to be used as a basic guide to achievable joist span for given depth and spacing, and should be used for estimating of feasibility only.

Due to variations in timber grades, load sets, support conditions and bearing widths, the tables are not suitable as a design tool. Please get in touch for more information and design assistance, we would be happy to advise and consult on what is best for your project.

United Kingdom Easi Joist Span Table

WS200 easi-joist®
Joist depth Joist centres Chord dimensions Maximum achievable span
195 400 72 x 35 4,675
97 x 35 5,025
122 x 35 5,275
147 x 35 5,500
600 72 x 35 4,025
97 x 35 4,425
122 x 35 4,725
147 x 35 4,925
WS200 easi-joist®
Joist depth Joist centres Chord dimensions Maximum achievable span
219 400 72 x 47 5,175
97 x 47 5,550
122 x 47 5,850
147 x 47 6,075
600 72 x 47 4,675
97 x 47 4,975
122 x 47 5,225
147 x 47 5,450
WS250 easi-joist®
Joist depth Joist centres Chord dimensions Maximum achievable span
254 400 72 x 47 5,650
97 x 47 6,025
122 x 47 6,350
147 x 47 6,625
600 72 x 47 5,075
97 x 47 5,425
122 x 47 5,675
147 x 47 5,925
WS300 easi-joist®
Joist depth Joist centres Chord dimensions Maximum achievable span
304 400 72 x 47 6,275
97 x 47 6,700
122 x 47 7,075
147 x 47 7,375
600 72 x 47 5,625
97 x 47 6,025
122 x 47 6,325
147 x 47 6,600
WS300 easi-joist®
Joist depth Joist centres Chord dimensions Maximum achievable span
417 400 72 x 47 7,200
97 x 47 7,650
122 x 47 8,000
147 x 47 8,275
600 72 x 47 6,400
97 x 47 6,775
122 x 47 7,075
147 x 47 7,325

United Kingdom and Ireland Roof Easi Joist Span Table

WS200 easi-joist®
Joist depth Joist centres Chord dimensions Maximum achievable roof span – BS Maximum achievable roof span – EC5 UK & Ireland
195 400 72 x 35 5,625 5,375
97 x 35 6,175 6,050
122 x 35 6,625 6,575
147 x 35 7,025 7,050
600 72 x 35 4,900 4,875
97 x 35 5,375 5,350
122 x 35 5,750 5,750
147 x 35 6,100 6,100
WS200 easi-joist®
Joist depth Joist centres Chord dimensions Maximum achievable roof span – BS Maximum achievable roof span – EC5 UK & Ireland
219 400 72 x 47 6,450 6,425
97 x 47 7,075 7,175
122 x 47 7,600 7,725
147 x 47 8,075 8,200
600 72 x 47 5,625 5,625
97 x 47 6,150 6,200
122 x 47 6,600 6,650
147 x 47 7,000 7,075
WS250 easi-joist®
Joist depth Joist centres Chord dimensions Maximum achievable roof span – BS Maximum achievable roof span – EC5 Uk & Ireland
254 400 72 x 47 7,250 7,275
97 x 47 7,950 8,050
122 x 47 8,550 8,675
147 x 47 9,050 9,200
600 72 x 47 6,300 6,325
97 x 47 6,900 6,950
122 x 47 7,425 7,475
147 x 47 7,850 7,950
WS300 easi-joist®
Joist depth Joist centres Chord dimensions Maximum achievable roof span – BS Maximum achievable roof span – EC5 UK & Ireland
304 400 72 x 47 8,350 7,650
97 x 47 9,175 9,325
122 x 47 9,850 10,025
147 x 47 10,450 10,650
600 72 x 47 7,250 6,900
97 x 47 7,975 8,075
122 x 47 8,550 8,675
147 x 47 9,050 9,200
WS400 easi-joist®
Joist depth Joist centres Chord dimensions Maximum achievable roof span – BS Maximum achievable roof span – EC5 UK & Ireland
417 400 72 x 47 10,300 8,375
97 x 47 11,275 10,475
122 x 47 12,125 12,325
147 x 47 12,825 13,025
600 72 x 47 8,875 7,550
97 x 47 9,700 9,450
122 x 47 10,375 10,550
147 x 47 10,975 11,150

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