Posi joist combines the lightness of timber with the strength of the posi strut steel web to produce a floor and roof system allowing you to span far greater distances than would be possible with alternative timber products.
Posi joist flat roof.
Donaldson timber engineering design and manufacture the mitek posi joist system.
1 enter joist details 1 1 span and joist spacing.
Posi joists are floor joists that are used when a lightweight but strong solution is required.
Usually 400 450 or 600mm but any value can be used up to 610mm max.
The full version allows any size.
Posi joist can adequately span for floors and for flat and pitched roofs often allowing for increased joist centres when compared to alternative systems.
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.
They are also commonly used in flat roofs for both domestic and commercial buildings.
Posi joists are dimensionally stable.
We generally supply i joists to the larger housebuilders due to their lower costs compared to posi joists.
Not suffering from shrinkage or distortion that can lead to squeaky floors.
Flat roof joist calculator.
Open web joists are manufactured using tr26 structural graded timber for the flange along with the mitek posi strut steel web.
This is the distance between joist centres.
Not only can posi joists be used in floors but they are also suitable for flat low and steep pitched roofs.
They allow for a greater span distance than solid joists and allow for more design freedom.
Additionally the wide flange gives a wide and stable fixing area for laying the floor and ceiling deck.
Due to variations in timber grades load sets support conditions and bearing widths the tables are not suitable as a design tool.
Posi joist combines the lightness of timber with the strength of the posi strut steel web to produce a floor and roof system allowing you to span far greater distances than would be possible with alternative timber products.
In roof applications posi joists are incredibly versatile and can be used for flat low and steep pitched roofs.
