ITW Construction Products



Alpine & Gang-Nail metal web roof, floor & wall systems

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Alpine - Roof Truss & Floor Joist Systems

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Alpine - Open Web Joist Manual

Alpine - SpaceJoist DL flyer


Alpine - SpaceJoist
Installation Guide for Timber Frame Construction

Alpine - SpaceJoist Installation Guide for Masonry Construction

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SpaceJoist Metal Web Joist System 

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New SpaceJoist: Ninja quiet, Sumo strong

Extensive research and development by ITW Industry has produced a new range of SpaceJoist “SJ” metal web joists. Comparison testing in November 2012 revealed that the SJ10(254mm) SpaceJoists (which also superede Gang-Nail Ecojoists) could achieve longer spans with less timber and fewer webs than both its predecessors and its two leading competitors. With outstanding strength characteristics and acoustic performance, the SpaceJoist “SJ” series gives manufacturers the competitive edge in this steadily growing market.

Testing proved that SpaceJoist metal webs are superior to its competitors in almost every way analysed. The additional perimeter teeth are unique and provide more bite, thus improving joist stiffness and reducing deflection. New burst through holes in the struts create a strong C-Section, improving compression strength in critical areas. Contact tabs transfer load from the metal webs to the timber chords to further increase web capacity.

SpaceJoist’s resistance to sound in non-separating floors exceeds minimum requirements for England, Scotland and Wales without the need for insulation, resilient bars or additional plasterboard. The 219mm deep SpaceJoist is the only metal web joist system in the industry that can achieve this when compared in August 2013. These benefits could each amount to considerable cost savings in timber, metal webs and time for manufacturer and builder alike.

Features & Benefits

Long spans: Longer spans are achievable in comparison to solid timber. This may eliminate the need for intermediate load bearing internal walls, thus reducing a building’s overall cost.

Reduced wastage: Manufactured to size eliminates site alterations saving time on site.

Design flexibility: SpaceJoists can be designed top hung to eliminate the rim board, decreasing the risk of timber shrinkage to improve air tightness.

Less timber and fewer webs: Tests show that the NEW SpaceJoist system requires less construction material - saving cost.

Sound performance: SpaceJoist delivers outstanding acoustic performance to comfortably pass English and Welsh regulations, even complying with the more stringent 43dB Scottish regs without additional insulation, plasterboard or resilient bars.

Easy to handle: Now even lighter, the lightweight construction makes SpaceJoist easy to individually manhandle on site without the need for crane hire. Alternatively, floor and roof sections (cassettes) can be delivered to site and craned into position to save build time.

Wide nailing surface: Fixing of floor and ceiling materials is simpler and quicker due to the minimum chord width of 72mm.
Engineered: SpaceJoists are manufactured offsite ensuring consistent quality and reliability.

Open web design: Fast and simple installation of services, without the need for drilling or notching. Joists can accommodate large services such as Mechanical Heat Recovery Systems.

Home grown timber: SpaceJoists can be manufactured in home grown timber - reducing carbon footprint.

Attic bottom chords: SpaceJoists can be incorporated into attic truss bottom chords to achieve greater spans, deeper insulation and provide a service void.

Clich here to find an ITW licenced fabricator.

For more information on SpaceJoist / Ecojoist or to get a quote, call us on 01252 551960 or email your drawings to

Click here for information on "SpaceRafter" metal web roofs.

Click here to visit our "Benefits of structural metal web timber frame components" listing on

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