<ol>
	<li>Carefully remove the existing ridge tiles, clean off all mortar and set aside (particular care being taken with the finial on the dormer roof).</li>
	<li>Remove the existing slates, battens and underslating and install new roof comprising of:- DuPont Tyvek Supro, a durable, water resistant membrane that is reinforced with a laminated polypropylene nonwoven. This airtight, vapour-permeable membrane is extremely water-resistant, and can be used for all supported and unsupported pitched roofs.</li>
	<li>Supply and fix new 38mm x 50mm tanalised timber battens at appropriate centres.</li>
	<li>Supply and fix new 600mm x 300m Marley Eternit Rivendale Fibre Cement Slate Roof Tiles (or similar approved), some 60 m2 The Rivendale features a finely detailed surface and dressed edges to reproduce the appearance of natural slate. The new slates and associated detailing would be installed in accordance with Marley&rsquo;s instructions using approved fixings., typically 30mm x 2.65mm slate nails and 19mm diameter by 2mm stem copper disc rivets.</li>
	<li>Supply, fix and dress in new Code 4 lead flashings to valleys (sides of Dormer) and around all chimneys. Rebed in a suitable mortar mix the previously set aside ridge tiles and finia</li>
	<li>On completion leave work area in claen and tidy condition.</li>
</ol>
