Steel Frame Assembly & Fixing
Seperatation under steel bottom plate
There should be a separation layer between the bottom plate of the steel framing and the timber subfloor. Just needs a simple layer of DPC (damp proof course).
Fixing frames together
Frames are stood and connected using self-drilling screws that we usually provide. We find a drill torqued to the correct setting works better than an impact driver for drilling the screws. Screws are generally placed every 600mm minimum, two side by side, use discretion.
Bracket fixings
There are several different off the shelf options available depending on design and application. Self drilling screws can be used to screw off. Offen the roof connection will need these hold downs.
Concealed Purlin Cleats (CPC)
Basically, a L bracket that can be great to tie the roof down to resist wind up lift. Come in different sizes.
Muiltgrip
A multipurpose bracket that can be bent into any of five combinations. Can be a flexible option.
Celing ties
Can be handy to hold the roof down.
Bracing
Brace straps
Lengths of steel with predrilled holes. Can be used on the outside or inside of the steel framing to make a roof or trailer connection. See trailer connection blog here.
Bracing straps are needed to be screwed and tightened to the outside of the framing. Should be added where possible to avoid openings on walls and roof. Keep an eye on plumb and level when tightening.
Packers
As seen in image above timber packers / wedges can be made up to fill and support a gable roof/wall connection for example. Timber is screwed in place and strapped down.
