Angle
Knee Portals
Data Sheet
Overview
The Red Stag TimberLab Angle Knee Portal has become a mark of success, combining the best in appearance with the best in economy.
A factory-made interlocking glued knee joint provides the basis of the three pin or two pin portal design used. The maximum inside height possible at the knee is obtained in this portal – a factor which gives it an advantage over the curved portal in some applications. The build-up of interlocking rafter and column panels means that the column section is wider than the rafter e.g. 3 x 42mm column panels interlock with 2 x 42mm rafter panels. This gives a column width of 5 x 42 = 210mm and a rafter width of 3 x 42 = 126mm. Column and rafter section taper from a maximum depth at the knee to a minimum depth at the base and apex. By increasing the depth of the panels and building up the number of interlocking panels, any practical span and spacing can be catered for.
On smaller spans or farm buildings a double column and single rafter combination can be used.
A simple bolted pin joint at the apex is all that is required to connect the full portal frame together. All apex fitting and base connections are done in Red Stag TimberLab’s factory and make for easy on-site assembly.
With a sanded and stained finish, these portals enhance the appearance of any community building or with a dressed finish they are an economic winner in industrial buildings.
Site Assembly – Members arrive on site in the form of half portals. With the use of a mobile scaffold to support the apex, erection is quickly achieved by lifting the half portals into position onto holding-down bolts and aligning the simple bolted apex joint.
An average of 7 to 10 portals can be fully erected in a working day. Each frame can be temporarily braced longitudinally so that a secure structure is available for cladding and roofing. With the convenience of nailing directly to the timber frames no specialist labour is required.
Notching or cutting or drilling the portals must be approved by the Red Stag TimberLab designer or design engineer.
Indicative Sizes for Angle Knee Portals
| Portal Span (m) | Frame Spacing | Eave Height | Light Roof & LL=0.25 kPa Column | Ceiling Rafter | Heavy Roof & LL=0.25 kPa Column | Ceiling Rafter |
|---|---|---|---|---|---|---|
| 8 |
3 4 5 |
2.5 2.5 2.5 |
315x149 315x149 315x149 |
360x65 360x65 360x65 |
315x174 315x174 360x174 |
360x90 360x90 405x90 |
| 9 |
3 4 5 |
2.5 2.5 2.5 |
315x174 315x174 315x174 |
360x90 360x90 360x90 |
315x174 360x174 405x174 |
360x90 405x90 450x90 |
| 10 |
4 5 6 |
2.5 2.5 2.5 |
315x174 315x174 360x174 |
360x90 360x90 405x90 |
360x174 405x174 450x174 |
405x90 450x90 495x90 |
| 11 |
4 5 6 |
2.5 2.5 2.5 |
315x174 360x174 405x174 |
360x90 405x90 450x90 |
405x174 450x174 450x210 |
405x90 495x90 540x90 |
| 12 |
4 5 6 |
3.0 3.0 3.0 |
360x174 405x174 450x174 |
405x90 450x90 495x90 |
450x174 450x210 495x210 |
495x90 540x126 585x126 |
| 13 |
4 5 6 |
3.0 3.0 3.0 |
405x174 450x174 405x210 |
450x90 495x90 450x126 |
450x210 495x210 540x210 |
540x126 585x126 630x126 |
| 14 |
4 5 6 |
3.5 3.5 3.5 |
450x174 405x210 450x210 |
495x90 450x126 495x126 |
495x210 540x210 585x210 |
585x126 630x126 675x126 |
| 15 |
4 5 6 |
3.5 3.5 3.5 |
405x210 450x210 495x210 |
450x126 495x126 540x126 |
540x210 585x210 630x210 |
630x126 675x126 720x126 |
| 16 |
4 5 6 |
4.0 4.0 4.0 |
450x210 495x210 540x210 |
495x126 540x126 585x126 |
585x210 630x210 675x210 |
675x126 720x126 765x126 |
| 17 |
4 5 6 |
4.0 4.0 4.0 |
495x210 540x210 585x210 |
540x126 585x126 630x126 |
630x210 675x210 720x210 |
720x126 765x126 810x126 |
| 18 |
4 5 6 |
4.5 4.5 4.5 |
540x210 585x210 630x210 |
585x126 630x126 675x126 |
675x210 720x210 765x210 |
765x126 810x126 855x126 |
| 19 |
4 5 6 |
4.5 4.5 4.5 |
585x210 630x210 675x210 |
630x126 675x126 720x126 |
720x210 765x210 810x210 |
810x126 855x126 900x126 |
| 20 |
4 5 6 |
5.0 5.0 5.0 |
630x210 675x210 720x210 |
675x126 720x126 765x126 |
765x210 810x210 855x210 |
855x126 900x126 945x126 |
Benefits
Economy – This type of portal has a proven cost saving record. Surprisingly, industrial projects already designed in steel, have been changed to Red Stag TimberLab Angle Knee Portals to take advantage of cheaper costs.
Shape – Because of the clean lines of the Red Stag TimberLab Angle Knee Portal, maximum height is obtained at the knee. This is especially significant for sporting facilities.
Simplicity – The pre-finished and stained members need a minimum of site handling. Shoes are factory fitted and once secured to anchor bolts on site, a few bolts at the apex complete the erection.
Purlin Fixing – Unique to this portal are the built-in purlin cleats. These are factory glued between the rafter panels and extend up to provide simple and direct fixing for purlins. This means that pre-cut purlins can be used to tie the portals together at pre-determined spaces. Girt block can also be built into the columns.
Note: Corbels to support floor beams can be incorporated into the column section of these portals for two storey construction.
Applications
Gymnasiums, churches, school halls, sporting facilities, factories, storage buildings, swimming pools.
Two storey buildings and gantry supporting corbels are also able to be incorporated in the versatile portal design. This portal form may also be adapted to provide clerestory profiles.
Specifications
See Specification Data Sheet
Note: Resorcinol glue should always be used for cross lap joints at the knees.
Quality Control
Red Stag TimberLab Ltd is a licensed manufacturer, independently audited under AS/NZS 1328.1 for glulam manufacturing (License No. 2916) and AS5068 for finger jointing (License No. 2915).
Regular in-factory quality control is carried out in conformance with these, third-party auditing carried out by Bureau Veritas.
Services Available
- Free cost estimates
- Experienced advice on suitability of Glulam design options
- Full engineering design and drawing facilities
- Complete building packages including design, manufacture, supply of all connections and components, and installation supervision
- Close liaison and client satisfaction are high priorities in Red Stag TimberLab’s personal care.
Nothing contained in this material shall be construed as a warranty or otherwise as to the accuracy or safety of the information provided. Specific design work should be carried out by qualified engineers.