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Posi-Joist – The Advantages Are Clear

With Talbot Timber Posi-Joists you get easy access for the installation and maintenance of the services in a floor zone is the clear advantage of the Posi-Joist flooring system.  With the move towards the building of more sustainable homes, an increasing number of mechanical ventilation and heat recovery (MVHR) systems are being installed in the UK and Ireland, driving more and more architects and specifiers to look for a versatile open web flooring solution.

With a range of joist depths from 203mm all the way up to 421mm and with varying timber chord widths, Posi-Joist caters for every eventuality.  If you require a rectangular void within the floor zone then a chase opening can be designed into the floor using two timber verticals in the appropriate location.

With Posi-Joist you have peace of mind.  Whilst solid joist alternatives may in some instances allow for the drilling of holes for services, the placement of these holes must adhere to strict guidelines.  By its very nature a Posi-Joist does not restrict you in this way, allowing a soilpipe to be though the floor zone close to bearing points and delivering maximum design flexibility.

Posi-Joists can be built into the inner leaf of an external cavity wall as illustrated. This method of construction meets the thermal and air leakage requirements of Building Regulations provided that the perimeter of the Posi-Joist is sealed with silicone sealant as shown and the wall is insulated to the Building Designer’s specification. Alternative proprietary built-in constructions may be used, such as joist ‘end caps’, provided that they have been shown by third party tests to meet or exceed the air leakage performance of the construction illustrated. The construction illustrated provides lateral restraint to the wall.  Note: Certain ‘end caps’ may not provide lateral restraint to the wall, and restraint straps may therefore be required.

Posi-Joists can be supported in masonry hangers at an external masonry wall. This method of construction meets the thermal and air leakage requirements of Building Regulations.  This detail does not provide lateral restraint to the wall unless a restraint type hanger is used, if standard masonry hangers are used restraint straps will be required.

In timber frame construction Posi-Joists can be top hung at an external timber frame wall.  This construction meets the thermal and air leakage requirements of Building Regulations provided that the floor edge is insulated by a material with a minimum R-value of 0.75mІ K/W and that a bead of sealant is placed between the skirting board and the floor deck and that an effective air barrier is maintained within the floor zone by means of solid noggins or header joists.  The construction provides lateral restraint to the wall provided that the connection is designed and detailed by the Building Designer.


Please use the contact form below to enquiry about Posi-Joists, each design and house is different,  so each quote is unique

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