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Building Solutions --> Masonry Stitching

Masonry Stitching Printer friendly version
1. RECONNECTING PARTY WALLS WITH EXTERNAL WALLS
	BONDED PARTY WALL A 12mm diameter hole drilled to the required length through the external wall and into the party wall. Normally 2 no. 5mm diameter Rotaflex rods per hole fixed with Rotafix Structural Adhesive. Material guide, 100cc per linear metre per 12mm diameter hole.
2. RECONNECTING INTERNAL WALLS WITH EXTERNAL WALLS
	SINGLE SKIN INTERNAL WALL Pre-determined slots on the internal wall are channelled out to specified heights and lengths, extending into the corner. 12mm diameter holes are drilled from the corner and angled into the external wall. Spiroties are bent to shape and anchored with Rotafix Structural Adhesive along the channel and into the 12mm diameter angled hole. Material guide, per linear metre of Spirotie, would be 100cc for each 10mm x 10mm bead and 100cc per linear metre for each 12mm diameter hole.
3. REPAIRING SEPARATED MASONRY
	Rotaflex rods are installed, usually into 12mm diameter holes, horizontally through the near section of the separation and at least 75mm into the far separation - normally every 2 to 3 courses. Each project should be considered individually before deciding on hole diameters and coursing.
4. CREATING MASONRY BEAMS/CRACK STITCHING
	Create a masonry beam using parallel lengths of Rotaflex rod bonded with Rotafix Structural Adhesive set into chases cut in the horizontal mortar beds - all in order to simulate a masonry beam in order to form a UDL. Material guide, 100cc of Rotafix Structural Adhesive per linear metre of 5mm diameter Rotaflex rod. In certain situations, Cembond cementitious/polymer grout may be the chosen adhesive. Crack stitching - suitable lengths of 5mm diameter Rotaflex rod extend either side of vertical cracking. For full details, see Rotafix Masonry Stitching sheet MS1297/3.
5. REPAIRING BRICK ARCH LINTELS
	Parallel lengths of Rotaflex rods extending 500mm each side of the lintel are bonded directly into the bedding joint above the lintel. Subsequent horizontal lengths of rod are introduced every three or four courses above.
6. REPAIRING CRACKS NEAR CORNERS AND OPENINGS
	Where cracks are less than 500mm from an external corner or an opening, a minimum length of 100mm of Spirotie should be bent and fixed into the reveal, avoiding puncturing any DPC membrane - or bent and bonded into the return wall. Rotafix Structural Adhesive should be the adhesive.
7. REPAIRING FAILED LINTELS
	Reinforced masonry beams may be created by bonding parallel lengths of Spirotie or Rotaflex rod into horizontal bedding joints. These should extend 500mm beyond each side of the opening. The first course should be directly above the opening and the second, three or four courses higher, depending on the masonry profile.
Note: 50mm deep is the preferred dimension for the installation of any horizontal bedding joints referred to in the above examples. Methodology:
	A • Drill M12 hole through brick/masonry and then 150mm into sound end grain timber. • Air flush. • Inject Rotafix Structural Adhesive into the drilled hole using the Rotafix extension tube. • Install Rotaflex pultruded 8mm diameter rod, to finish 10mm below external brick masonry. • Flush point.
	B • Drill M12 hole through masonry. • Wood auger (M12) through first and second joist. • Remove floorboard, air flush hole in masonry. • Install 8mm threaded ss Rotaflex rod • Fix nut and washer. • Backfill masonry hole with Rotafix Structural Adhesive
	C • Remove floorboard, drill at 45Ø through joists at 120mm into masonry/brick. • Air flush. • Inject Rotafix Structural Adhesive. • Install 8mm diameter threaded S/S Rotaflex rod. • Allow to cure. • Tension nut and washer.
FOR FURTHER INFORMATION CONSULT THE FOLLOWING ROTAFIX DATA SHEETS CB10T (PD3550/4) TC4 (PD3475/10) CEMBOND GROUT (PD3160-1/2) Rotafix Structural Adhesive (PD3552) ROTAFLEX ROD (PD3664-3711/11) SPIROTIE (PD3801-2/1) DEVELOPERS, MANUFACTURERS AND SUPPLIERS OF RESIN AND POLYMER PRODUCTS "Advice and assistance provided without charge is given in good faith but without responsibility". Recommendations regarding the methods, use of materials and construction details are given as a service to designers, contractors and end users. Any drawings are intended only to illustrate various possible applications and should NOT be taken as the basis of design.