STRUCTURAL REPAIR STRATEGY

Masonry may deteriorate, crack, delaminate and fail for a variety of stress related factors and reasons. These problems can be overcome by using a variety of remedial ties and masonry reinforcement products and techniques. In conjunction with the Helibeam System other products are able to remedy specific problems. Using various combinations of ties, fixings and reinforcement rods, virtually any structural failure can be remedied.

At DLC Structural we take great pride in identifying and diagnosing the specific structural defect for any property. From our free initial consultation and survey, to the final completed scope of works, you can rest assured you’re building is in safe hands.

Please see examples below showing the different kinds of key structural repairs DLC specialise in:

1) RECONNECTING PARTY WALLS WITH EXTERNAL WALLS

CemTies are installed simultaneously with HeliBond grout into angled clearance holes drilled, to the required length, through the external wall and into the party wall.

3) REPAIR OF BAY WINDOWS

Twin HeliBars are bonded into a predetermined cut slot around the bay above the window with the ends embedded in the front elevation. BowTies are driven in the joist ends via clearance holes in the masonry and low level cracks are stitched with single HeliBars

5) RECONNECTING INTERNAL WALLS WITH EXTERNAL WALLS

Predetermined slots on the internal wall are channelled out to the specific length right into the corner. Angled holes of 10mm diameter are drilled from the corner into the external wall. Single lengths of HeliBar are bent to shape, with the angled end bonded into the hole with PolyPlus resin and the remainder grouted with HeliBond into the internal wall

7) REPAIRING CRACKS NEAR CORNERS AND OPENINGS

Where cracks are less than 500mm from an external corner or an opening, at least 100mm should be bent around the corner and bonded into the return wall or bent and fixed into the reveal, avoiding any DPC membrane.

9) CREATING MASONRY BEAMS

The Helibeam System uses parallel lengths of HeliBar reinforcing bonded into predetermined cut slots (normally the mortar beds) with HeliBond grout to form deep masonry beams which distribute building loads.

11) CREATING MOVEMENT JOISTS

A 400mm HeliBar is installed across the joint, as with cracks, but is only bonded at one end. The other end is allowed to move freely by inserting into a sleeve which is then bonded into the masonry.

13) REPLACING CAVITY WALL TIES

DryFix wall ties are power driven into both leaves, via a small pilot hole of around 6mm diameter.

– OR –

RetroTies are driven into a 4.5mm pilot hole in the far leaf via a clearance hole in the near leaf into which they are bonded with PolyPlus.

– OR-

ResiTies are resin bonded into a 10mm hole in both leaves.

2) STABALISING BOWED WALLS INTO JOIST ENDS

BowTies are inserted through a clearance hole in the masonry and power driven directly into the joist end before bonding the PolyPlus resin into the masonry.

4) REPAIRING SEPARATED MASONRY

CemTies and HeliBond grout are installed into clearance holes drilled through the near leaf and at least 75mm into the far leaf. The density of the ties will depend upon the degree of separation, the material, the cause and the condition of the masonry overall.

6) REPAIRING BRICK ARCH LINTELS

Parallel lengths of HilBar rod are bonded into the specified cut slots directly above the existing lintel. Angled CemTies are installed through the lintel and into the masonry above the lower HeliBars.

8) STABILISING BOWED WALLS INTO JOIST SIDES

BowTie HDs are inserted through clearance holes in the masonry and are power-driven through the first and second joist (and third, if required) before the outer end is bonded into the masonry with PolyPlus resin.

10) CRACK STITCHING

Lengths of HeliBar extending 500mm either side of the crack are bonded into cut slots, normally the mortar beds, with HeliBond PolyPlus resin.

12) REPARING OR CREATING FLAT ARCH LINTELS

Parallel lengths of HeliBar are bonded into the specific cut slots above the existing lintel.

14) CEILING JOIST PINNING

RetroTie fixings are driven at an angle through the joist and into the masonry, via a small pilot hole, and the projecting end is hammered over.

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D.L.C. Structural Solutions provide expert structural repairs & general building work at affordable prices throughout Sunderland, Middlesbrough, Durham, Hartlepool and the surrounding areas.

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