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BOWFIX
BowFix is a fixing used to stabilise bowed walls. 8mm in diameter the one point fixing is installed directly into the side or the end of floor joists via a clearance hole, around 12mm in diameter,
in the outer masonry.
BowFix are manufactured from Grade 304 Cu corrosion resistant stainless steel and are helical along the whole of their length. Grade 316 is also available. Bowfix are available in lengths between 400mm and 900mm and are supplied in single units. The manufacturing process produces very hard fins, that are able to cut a thread into the timber, and a soft and flexible core. The near leaf fixing is achieved by the use of HeliResin or HeliGrout 25.
Historically
The cause of bowing walls in many old buildings may well be due to the fact that there is no mechanical connection between the floor and ceiling joists and the masonry. The traditional method of connection has been to rely on friction due to gravity. When this frictional resistance is released, due to movement over the years within the timbers or masonry, it can leave a freestanding wall of considerable height that is very susceptible to bowing.
The problem of bowing walls has been addressed in the past by the use of S or X ties (hoop irons) bonded right through the building with bars to connect the front and rear walls or the two side walls together. The BowFix uses the same principles as this proven but unsightly method of restraint for bowing walls. The advantage of the BowFix is that it can be installed remedially and externally and uses the existing structural members to provide the necessary stability.
Presently
The current method of standard repair is to introduce a galvanised strap tying the floor to the wall. This involves removing furniture, carpets, skirtings and floorboards, the chasing out of plaster, the fixing with plugs and screws or nails and the subsequent making good. Therefore, although the product itself is very cheap the disruption involved during the installation makes this a very expensive option which relies on the holding capacity of plastic plugs and screws.
BowFix Solution
BowFixes can be installed both into side of joists and ends of joists. Installation is performed from outside the building through a 12mm hole in the building fabric. It must be emphasised that a check must be made for any services that may run through the floor or ceiling cavity. It is quite common for wiring to be present and is certainly not unknown to have water pipes for the heating system or even a mains water pipe in this location. It is recommended that checks are made in this area with the use of a boroscope.
BowFix into Side of Joist
In instances where the floor joists run parallel with the wall, the BowFix is inserted into the second joist. In this way, the strength and the load sharing is achieved via the floorboards on top of the joists and the ceiling boards below the joists crossing from one joist to the next. The old connecting bar is effectively replaced by the floor and ceiling boards already in place.
BowFix into End of Joist
Where the floor joists run into the wall and sit in pockets within the masonry, the BowFix is inserted into the end grain of the joist.
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HELICAL SYSTEMS LTD
GENERAL HELITIE FIXINGS
HeliTie Fixings for Timber to Timber and Timber to Masonry are manufactured from Grade 304 Cu corrosion resistant stainless steel and are helical along the whole of their length with one point.
They are available in diameters of 8mm and in lengths between 80mm and 300mm. Grade 316 is also available. They are supplied in boxes of 100.
Standard Fixing of Perpendicular Timbers
The HeliTie must be inserted to a minimum depth of 150mm into the timber. Minimum of 2 fixings per joint. Minimum depth of fixing to be two thirds of the overall depth.
Standard Fixing of Timbers
The HeliTie must be inserted to a minimum depth of 150mm into the timber. Minimum of 2 fixings per timber of each joint. Minimum depth of fixing to be two thirds of the overall depth.
Standard Fixing of Angled/Upright Timbers
The HeliTie must be inserted to a minimum depth of 150mm into the timber. Minimum of 2 fixings per joint. Minimum depth of fixing to be two thirds of the overall depth.
Features and Benefits
HeliTies are excellent as a timber to timber fixing.
Grade 304 is standard, Grade 316 is also available.
It is not necessary to pre-drill in carcassing timber, a pilot hole is usually only necessary in dense timber such as oak.
HeliTies are excellent in achieving a fixing into end grain of timber.
HeliTies, by their design, fix along the whole length of the tie.
HeliTies have no head and consequently do not split timbers.
As HeliTies have no head there are no unsightly bolts and washers.
Specialist power support tooling is recommended, ie PST2 (to which extensions can be attached) or the basic model PST3, both with SDS connections.
All fixings can be tested with a Load Test Unit.
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HELICAL SYSTEMS LTD
