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Open Web JoistsOpen Web Joists
Open Web JoistsOpen Web Joists
Product Overview
What is an Open Web Joist?What is an Open Web Joist?
In Essence they are Warren GirdersManufactured from
TR26 Grade Truss Timber &
Steel Webs
Common QuestionsCommon Questions
• What depths do they come in?
DepthsDepths
Strut Size Overall Depth
Gap Depth
PS8 202mm 108mm
PS9N 225mm 131mm
PS10N 254mm 160mm
PS12 302mm 208mm
PS14N 373mm 279mm
PS16N 421mm 327mm
HoweverHoweverThere are also a number of factors to consider here, like
span, centres, flange width and loading conditions. Beams may also be on edge
With 47mm timber on flat, there are 6 sizes of web / joist
Common QuestionsCommon Questions
• What depths do they come in?• How are they made?
Strut RunnerStrut Runner
Joists can also be made on a normal truss press but there may be problems restraining the top edge of the timber using standard truss clamps
Common QuestionsCommon Questions
• What depths do they come in?• How are they made?• What width flanges to they have?
Flange WidthsFlange Widths
• 47mm on edge• 72mm - 147mm on flat• Maximum 4ply on edge• Maximum 2 ply on flat (Up to 294mm)
On a standard run of joists you ideally want the flange width to be 72mm or 97mm on flat.
Maximum recommended chords on edge are 97mm
Common QuestionsCommon Questions
• What depths do they come in?• How are they made?• What width flanges to they have?• How do they compare in price to
solid timber and I-Joists?Singly, they may be a little more expensive.
HoweveHoweverrand fit
quickerSpan further…
They Give better access for services
RESULTThe overall job is
cheaper
Benefits of Open Web JoistBenefits of Open Web Joist
• Access for services
Access for ServicesAccess for Services
Note soil pipe next
to the bearing
Access for ServicesAccess for Services
Benefits of Open Web JoistBenefits of Open Web Joist
• Access for services• Larger spans than cut timber & I-
Joist
I-Joist Span TablesI-Joist Span Tables
241 deep, Series 550 Joist @ Rating 45 Spans 4.3m
Open Web Joist SpansOpen Web Joist Spans
254 deep PS10N Spans 5.14m – That’s 0.84m more
Open Web Joist SpansOpen Web Joist Spans
• Based on 400mm centres and standard loads
72mm 97mm 122mm 147mm
PS 8 4880 5210 5480 5695
PS 9N 5100 5430 5685 5900
PS 10N 5520 5880 6160 6400
PS 12 6330 6760 7120 7410
Benefits of Open Web JoistBenefits of Open Web Joist
• Access for services• Larger spans than cut timber & I-
Joist• Inherently stable – faster assembly, minimal
bracing
I-Joist Bracing RequirementsI-Joist Bracing Requirements
Open Web Joist Bracing RequirementsOpen Web Joist Bracing Requirements
Benefits of Open Web JoistBenefits of Open Web Joist
• Access for services• Larger spans than cut timber & I-
Joist• Inherently stable – faster assembly, minimal
bracing
• Light weight
Benefits of Open Web JoistBenefits of Open Web Joist
• Access for services• Larger spans than cut timber & I-
Joist• Inherently stable – faster assembly, minimal
bracing
• Light weight• Rigid design – easier manual handling than I-
Joist
Benefits of Open Web JoistBenefits of Open Web Joist
• Access for services• Larger spans than cut timber & I-
Joist• Inherently stable – faster assembly, minimal
bracing
• Light weight• Rigid design – easier manual handling than I-Joist
• Squeak free – cross grain shrinkage is minimal
Benefits of Open Web JoistBenefits of Open Web Joist
• Access for services• Larger spans than cut timber & I-Joist• Inherently stable – faster assembly, minimal bracing
• Light weight• Rigid design – easier manual handling than I-Joist
• Squeak free – cross grain shrinkage is minimal
• Versatility
Open Web Joist VersatilityOpen Web Joist Versatility
TRIMMABLE TRIMMABLE ENDSENDS
TOP BEARINGTOP BEARING
Open Web Joist VersatilityOpen Web Joist Versatility
Trend towards Multi-Storey Trend towards Multi-Storey DwellingsDwellings
Open Web Joist Growth Since 1997Open Web Joist Growth Since 1997
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