There appears to be bad workmanship and supervision at this work site. It would not have been signed off at this stage of works if it was detected by competent management this would have been achieved by adopting the provisions of schedule 7 of the building regulations 1976. • • • Tension straps should have a declared tensile load capacity of no less than 8 kN and a displacement of not more than 2mm. Strap has not been notched into timber joists to allow flooring to sit level on floor Joists do not have any noggins in place these should be at least ½ the depth of existing joist minimum 38mm this would have created movement and bending/twisting of the joists and possible cracking of downstairs ceilings. There is no packing between the first joist and the wall this may cause wall to become unstable. Strap appears to be not sitting flush and tight to wall with no secure fixings. Insufficient lateral restraint does not cover the sufficient three joists this is also without secure fixings, this will cause wall and timber joists to move and bend and possible wind movement to roof BS 6399: Loading for buildings: Part 2: 2001 Code of practice for wind loads. BS 5268-2:2002 Structural use of timber. Code of practice for permissible stress design, materials and workmanship BS EN 845-1:2003 Specification for ancillary components for masonry. Ties, tension straps, hangers and brackets In accordance with Regulation Part A Structure 2005 p.29 diagram 16b; this would be the correct way of installing this tension strap.
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The following is a job sheet detailing the scope of works to be carried out on this maintenance issue. Regards Terry Jones (Site manager)
OPERATIVE SITE ADDRESS
JOB SHEET DATE 14/2/10 COMPLETION DATE
REF DAS 25
MATERIALS • 4x restraint straps 30x5x1000mm –galvanised steel 1x box 8 x 1 1/2” screws 1x box 10 x 2” screws 1x 50 pack 7mm brown raw plugs 4m x 38x100mm timber 4x celcon blocks 20x London brick 3x builders sand 1x cement
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SCOPE OF WORKS 1. 2. 3. 4. 5. 6. Lift existing floor coverings and keep safe to be reinstated. Remove skirting, lift floorboards to expose 3 joists. Internal wall knock out 1 block above floor line x4. Pilot external wall with 15mm drill for position of hole x4. External wall remove 1 brick in line with internal floor line x4. Reinstate noggins between joists every 400mm centre secure and fix (see sketch). 7. Packing to be re-instated between joist and wall. 8. Notch out joist 30mm x 7mm so strap sits below top of joist* to cover 3 joists. 9. Steel straps maximum spacing of 2m apart. 10. Fixing to internal wall with 7mm raw plug 10x2” screws. 11. Reinstate floor boards and secure with 1 ½ “screws. 12. Reinstate brick to external wall matching existing pointing. 13. Reinstate block to internal wall and make good / plaster. 14. Reinstate skirting boards. 15. Make good / paint. 16. Relay floor coverings. 17. Clean site.
COMPLETED OPERATIVE SIGN ……………………..
RETURN VISIT DATE …………….
OTHER DATE …………….
Defect report sheet DAS 1 Failure: Condensation, mould, growth, corrosion and rot in roof space. Defects: Inadequate provision for ventilating roof space to outside air.
Ventilation in this roof area is insufficient; Also the existing vent holes that are within the soffits are inadequate by a factor of 20 and are not letting enough air flow to pass through the loft space the plans for this property did not put into place adequate ventilation as required in clauses 22.8 to 22.16 of BS5250:1973 ‘the control of condensation in buildings’. This can/will create major problems in loft space and has/will lead to a high level of condensation, dampness and rot. At present the…