<p>Upon our attendance at Streatham Tate Library, where a GDC Building Services operative attended an emergency call out to remediate a leaking roof we have identified several causes to the leaks and water damage observed inside the building.</p><p>Upon our inspection of the roof at Streatham Tate Library, 63 Streatham High Road, London,&nbsp;SW16 1PN we have identified slipping roof slate tiles on the East facing elevation of the pitched roof. We have identified the cause of the slate tiles sliding off the roof is due to lamination of the slate. This is a naturally occurring process that wears the slate down deteriorating its fabric causing the slate to break free from the nail. A further cause leading to the dilapidation of the roof is the rotting of the nails used to affix the slate tiles. The oxidation process weakens the holding capacity of the nails causing over time the nail to give under the weight of the slate.</p><p>Further discovered upon our inspection we have found that prior patch repairs have been performed on the roof since lead straps were found the holding a number of tiles in place.</p><p>Upon our attendance we have performed a temporary repair to the slipped tiles within hand reach of a ladder. This repair does not entail a warranty to prevent further water leaks as the scope of works required to alleviate the issue is comprehensive.</p><p>Given our discoveries i.e. the prior patch repairs our proposal to alleviate further water damage to the internal fabric of the building is take up the existing slate roof tiles and replace them with eternit&nbsp;(man made) slate.</p><p>Please see breakdown of our proposed quotation:</p><ul><li>Operatives to apply protective sheeting to work routes and working areas:</li><li>Tube and fittings scaffold to be erected in order to enable access to eastern elevation of the building</li><li>Access to roof to be gained via light duty roof access system</li><li>Existing deteriorated slate tiles to be lifted and disposed off&nbsp;in site skip provided&nbsp;</li><li>Existing battens and roof felt to be removed and disposed off in site skip provided&nbsp;</li><li>Stepped lead flashing to be removed and disposed off in site skip provided</li><li>New breathable roofing membrane to be applied&nbsp;</li><li>New battens 50x25 battens at 260 gauge&nbsp;to be fitted&nbsp;</li><li>New stepped lead flashing dressed over soakers to be fitted along abutment walls</li><li>Commence&nbsp;to renew roof with Eternit 500x250&nbsp;slates in a double-lap manner and&nbsp;affixed&nbsp;in accordance with the relevant British standards&nbsp;</li><li>All waste to be removed from site</li><li>Scaffold to be decommissioned</li></ul><p>Our total cost to carry out the above works in / out of normal working hours shall be: &pound;13,013.49</p><p>Please see breakdown below:&nbsp;</p><p>Labour: &pound;8,400.00</p><p>Materials: &pound;1,697.49</p><p>Plant and Hire: &pound;2,500.00</p><p>Waste Disposal: &pound;416.00</p>