<p><strong>RE: Digital Realty, Unit 1, Airport Gate, West Drayton UB7 0NA</strong></p><p><strong>&nbsp;</strong></p><p>Following the recent gutter cleaning works carried out at the above site, we are pleased to provide our quotation for the additional work discussed, and our recommendations for future works to preserve the life of the existing roof:</p><p>&nbsp;</p><p><strong>Item 1 - Gutter Outlet Clearance</strong></p><p><strong>&nbsp;</strong>The Centre outlet along the right eaves gutter is blocked with the roots of a buddleia bush that was growing from the outlet. We were not prepared to endeavor to remove it at the time of the gutter cleaning as we were concerned at the likelihood of damaging the internal rainwater pipe and the effect this would have if there was water ingress in the building. Our suggested specification is as follows:</p><p>Erect within the corridor two alloy towers and bridge over the equipment below using lightweight stagings, together with suitable handrails.</p><p>Remove the lagging surrounding the rainwater drainage pipework and set aside for re-use.</p><p>Engage Sapoflow Ltd. drainage company (who installed the system originally) to remove affected pipework and replace, as deemed necessary.</p><p>Provide an aerial platform to allow the specialist drainage company access to inspect the siphonic action of the outlet externally.</p><p>Reinstate &nbsp;the &nbsp;lagging &nbsp;surrounding &nbsp;the &nbsp;pipework &nbsp;and &nbsp;remove &nbsp;the &nbsp;access equipment, upon completion.</p><p>We have assumed that the ceiling tiles and supporting grid system, where necessary, will be removed by the client&rsquo;s personnel prior to our arrival on site and free of charge to ourselves.</p><p><strong>Our Total Cost to carry out the above is &pound;3,934.00+VAT</strong></p><p>&nbsp;</p><p><strong>Item 2 - Gutter Rainwater Pipe - First Floor Kitchen</strong></p><p><strong>&nbsp;</strong>The valley gutter rainwater outlet above the first floor kitchen appears to be leaking from the pipework, although water ingress from the outlet plate in the surface of the gutter cannot be eliminated at present. Access to this area is extremely limited and would require the removal of a substantial amount of the suspended ceiling and supporting grid system to allow access to the rainwater pipework.</p><p>Erect within the corridor and kitchen two alloy towers and bridge over the partition wall below using lightweight stagings, together with suitable handrails.</p><p>Engage Sapoflow Ltd. drainage company to inspect the affected pipework and replace or reseal, as deemed necessary.</p><p>Remove the access equipment upon completion.</p><p><strong>Our Total Cost to carry out the above is&nbsp; &pound; 3,677.00+VAT</strong></p><p><strong>&nbsp;</strong></p><p><strong>Provisional Sum</strong></p><p><strong>&nbsp;</strong>Although we have made our specification as comprehensive as possible, we suggest that a provisional sum be set aside to cover any work, not included in the above items, which may become apparent after commencement of the contract. For example, additional works by the specialist drainage contractor.</p><p>In our opinion, the following sum would be adequate to cover possible requirements of this nature, but this is not a quotation for carrying out any specific work and no expenditure would be incurred out of this provisional sum without your agreement.</p><p><strong>Suggested Provisional Sum : &pound; 950.00+VAT</strong></p><p>&nbsp;</p><p><strong>Item 3 - Gutter Joint Repairs</strong></p><p><strong>&nbsp;</strong>It was noticed during the recent works that many of the gutter joints and some of the gutter outlets have been repaired in the past, with the application of either liquid coatings or bitumen reinforced aluminium tape. Where grass has grown in the gutters over the years, the roots have penetrated beneath the coating and tape, which has left the gutter joints vulnerable to water ingress.</p><p>We suggest that whilst the scaffolding handrail and access tower are in place, the gutter joints are sealed with a liquid waterproof coating. The life expectancy of this coating is approximately twelve months, and should only be considered a temporary solution.</p><p>Clean and prepare the gutter joints and the outlets that have been previously treated, and apply one coat of <strong>Aquashield Highbuild </strong>high performance coating compound to the accessible internal girth of the gutter joints. <strong>Aquashield </strong>has a one-component polymeric gel composition reinforced with Fibreflex. This compound contains no bituminous materials, which enables the product to stay permanently flexible.</p><p><strong>Our total cost to carry out the above works only is &pound;5,960.00+VAT</strong></p><p>&nbsp;</p><p><strong>Item 4 - Long-Term Refurbishment Works</strong></p><p><strong>&nbsp;</strong>The existing roof sheets are Plastisol coated steel sheets and the plastic coating is peeling at the gutter edge and end lap of the intermediate sheet. If left in this condition, the steel core will corrode and eventually the roof sheeting will need to be replaced. Consequently, we suggest that the peeling coating is treated to preserve the life of the roof sheets.</p><p>The gutters are manufactured from galvanised steel sheets, which have subsequently been coated with a liquid bitumen coating. At the fold lines, the bitumen coating has worn away and the steel is corroding. If left in this condition, the gutters will rust and eventually perforate, causing water ingress within the building.</p><p>Photographs are included at the end of this quotation, highlighting the areas of concern. Bearing the above in mind, our specification is as follows:</p><p>To the intermediate end lap of the roof sheeting and the gutter drip edge, we propose to carry out repairs to the cut edges of the roof sheets where corrosion is taking place using the Seamsil 100 specification, all to be carried out in accordance with the manufacturer&rsquo;s instructions.</p><p>Remove all loose and flaking coatings to a firm feathered edge. Remove rust and white salts by very thorough cleaning/abrading. Ensure substrate is keyed and not polished. Thoroughly clean and dry the surface, using Isopropyl Alcohol as necessary. Thoroughly dry the lap using a mechanical driven blower. Ensure all debris and grinding swarf is removed before application of Seamsil.</p><p>A sealed overlap can be achieved by gun applying the Sealant into the overlap, immediately over coating with the Basecoat followed by Topcoat when dry.</p><p>Gun apply SEAMSIL&reg; Sealant, into the lap to form a complete bridged seal. Apply Seamsil Basecoat before the Sealant has cured (i.e. wet on wet). The upward brush movement of Basecoat should further force the Sealant into the lap joint allowing it to make full contact with both the exposed and underside surfaces of the top sheet&rsquo;s leading edge. Apply one coat of SEAMSIL&reg; Basecoat to all prepared surfaces ensuring coverage of all exposed steelwork. Apply to at least 1&rdquo; [25mm] either side of the joint. Sealant and Basecoat must form a joint fillet between the laps that visually obscures the leading edge of the top sheet.</p><p>Overall length of end lap and gutter edge treatment will be approximately <strong>540 </strong>linear metres</p><p>Sweep clean and prepare the gutter surface, with all debris being placed into polythene bags and removed from site.</p><p>Apply by brush or roller one coat of AH-25 Hydrostop Primer K at a rate of 0.1 ltr/m2.</p><p>Apply AH-25 liquid waterproofing system using a small roller at a rate of 1.2 ltr/m2, apply the AH-25 polyester fleece onto the wet liquid waterproofing system, leaving no cavities or creases. Subsequently coat the fleece generously with AH-25 liquid waterproofing at a rate of 0.8 ltr/m2.</p><p>AH-25 liquid waterproofing system is a one component coating system which is isocyanate and solvent free based on alpha-hybrid, silane terminated polyether technology.</p><p>Overall area of gutter treatment would be approximately <strong>195 </strong>linear metres.</p><p><strong>Our total cost to carry out the above only is &pound;55,157.00+VAT</strong></p><p><strong>Health &amp; Safety</strong></p><p>In accordance with the `Health and Safety at Work Act 1974&rsquo; under which we have a joint obligation, we propose to erect an access tower and approximately 230 linear metres of scaffolding handrails to the exposed eaves and gable ends. This would be supplied, delivered and erected for the duration of the works. Upon completion, this would be dismantled and cleared from site.</p><p><strong>Additional Cost of Health &amp; Safety: &nbsp;&pound; 15,200.00+VAT</strong></p><p><strong>Our total cost to carry out all of item 4 works shall be - &pound;70,357.00+VAT</strong></p><p>&nbsp;</p><p><strong>Our total cost to carry out all items as mentioned above in normal working ours shall be - &pound;84,878.00+VAT</strong></p><p>&nbsp;</p><p><strong>Guarantees&nbsp;</strong></p><p><strong>&lsquo;Seamsil 100&rsquo; </strong>end lap treatment system as specified above and applied by this company will be guaranteed against leaks through the works for a period of <strong>TEN YEARS </strong>from the date of completion of the work.</p><p><strong>AH-25 Liquid Waterproofing System </strong>as specified above and applied by this company will be guaranteed against leaks through the works for a period of <strong>TWENTY YEARS </strong>from the date of completion of the work.</p><p>Any leaks developing through the weatherproofing during this period will be remedied by this company, free of charge for labour and materials. Areas requiring treatment will be covered by a similar guarantee for the balance of the original guarantee period. Materials required for remedial work will be specified and supplied by ourselves to effectively seal defective areas.</p><p>&nbsp;</p><p><strong>The following exclusions apply:</strong></p><p><strong>1). &nbsp;</strong>Damage caused by persons working on the roof.</p><p><strong>2).&nbsp; &nbsp;</strong>Damage caused by excessive distortion of the sub-structure, subsidence, or other abnormal factors.</p><p><strong>3). &nbsp;</strong>Damage caused by other forces beyond our control, e.g. explosion, fire, etc.</p><p>&nbsp;</p><p><strong>General Items</strong></p><p>Our prices do not include VAT, which will be added to our invoice at the appropriate rate. Our quotation has been calculated on the following assumptions:</p><p><!--[if !supportLists]-->a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <!--[endif]-->All old material and debris removed from the roof will be loaded into skips or lorries provided by ourselves, and removed from site at our expense and as our property.</p><p><!--[if !supportLists]-->b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <!--[endif]-->The above works will be carried out during normal working hours, (i.e. Mon. - Fri. 8.00</p><p>a.m. and 5.30 p.m.) and that no restrictions will be placed on the hours that we may work.</p><p><!--[if !supportLists]-->c)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <!--[endif]-->Our operatives will not be involved in waiting time or repeated breaks in continuity.</p><p><!--[if !supportLists]-->d)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <!--[endif]-->Suitable &nbsp;safe &nbsp;storage &nbsp;will &nbsp;be &nbsp;provided &nbsp;by &nbsp;yourselves &nbsp;for &nbsp;our &nbsp;materials, &nbsp;plant &nbsp;and equipment close to the works.</p>