Seaham Windows

Seaham Windows, Doors & Conservatories

Lightweight Roof System

The Seaham Windows Lightweight Roof System has been designed to be retro-fitted onto existing conservatories, converting your conservatory into a room that is usable all year round. We can also install the roof system as part of a new conservatory installation, giving you a stunning new room.

For centuries slate roofing has been desired for its durability and beauty. With authentic surfaces and edges, our slate system highlights the handsome character of slate, at the same time enhancing roof performance through innovative design. Unlike natural slate, our slates won't break or delaminate.

Our slates are created with moulds cast from real slate to capture genuine peaks and curves.

Colour-through design and UV stabilisation ensure stay-true richness for traditional colours such as Pewter Grey and Plum, bold tones like Brick Red and unique selections such as Emerald Green and Grey/Black blended tiles.

Internal Finish

Our roof system can accomodate a number of features including roof-mounted windows, fully plastered internals including vaulted ceilings, spotlights, pelmet mounted lighting and more.


Choice of slate colours, hover over the samples below to choose your colour:

Traditional Stone Black Alternative Dover Grey Alternative Slate Grey Traditional Pewter Grey
Alternative Charcoal Grey Traditional Plum Alternative Emerald Green Traditional Brick Red
Alternative Chestnut Brown Alternative Moss Green Alternative Forest Green Grey Black Blend
Green Grey Blend Alternative Evergreen Alternative Ash Grey Alternative Granite
Alternative Granite

Structural Engineers Report

Upon receipt of the structural details and roof specification of Seaham Windows Lightweight Roof System, the Structural Engineer penned a report which deemed the structure to be both weatherproof and provide a stable structure. The roofcovering provides a lightweight, consistent, reliable solution that meets all necessary performance and regional wind and snow loadings.

Limited Lifetime Warranty

The Tapco Group™ (“TTG”), a Headwaters Company, warrants to the original owner and to the party to whom the original owner transfers ownership as permitted in this document (a “permitted transferee”) that its Tapco Slate roofing products (collectively referred to in the remainder of this document as, the “product” or, the “products”) will be free from manufacturing defects resulting in warping, cracking, splitting, rotting, peeling, flaking and blistering when subject to normal use. There is no limit on the duration of this warranty although it is subject to all of the limitations, terms and conditions that follow. While there is no duration on the term of this warranty, the owner should be aware that many things may affect the durability of the products, including things that TTG cannot control such as, for example, the weather, the adequacy of ventilation, and whether proper installation techniques and materials are used. This warranty is intended to provide the owner with a level of comfort that TTG properly manufactured the products such that they will perform as specified. This warranty is not however, intended to provide an absolute assurance that the products will last forever. Subject to the provisions that follow, provided that the warranty claimant is able to establish the date of purchase, the original cost of the defective products, and the fact that the claimant is either the original owner or a permitted transferee to the reasonable satisfaction of TTG, should any manufacturing defect occur during the lifetime of the original owner or for such other time as may be provided to a permitted transferee under the terms of this warranty, TTG will at its sole option either: a) provide product (specifically excluding replacement underlayment and metals used for hips, ridges, and valleys) at a cost pro-rated pursuant to the specification appearing in the table below and, until the seventh anniversary after installation, an amount to cover the cost of labour, subject to the limitations below, to complete the replacement; or, b) refund the amount paid by the original owner for the defective product.

No product replacement under this warranty will alter the pro-ration specification below, which shall run from the date of the original purchase of the Tapco Slate products. Any replaced product shall be warranted in accord with the pro-ration specification that governed the original purchase. The lifetime coverage offered by this warranty automatically ends upon the sale of the property or death of the last of the original owners of the property at the time of purchase whichever first occurs. No benefits under this warranty whatsoever shall accrue to any owner and TTG shall incur no liability under this warranty unless and until the Products installed on the owner’s structure have been paid for in full either by owner or by a predecessor in interest of owner.

In the event of damage caused by wind or hail during the warranty period, before any warranty coverage shall apply, the owner must pursue the cost of replacement or repair of damaged material through any applicable insurance. Any cost incurred by the owner in excess of the insurance contribution (excluding any insurance deductible), subject to the proration schedule identified below will be reimbursed by TTG provided that TTG will in no event be liable for costs in excess of the cost of the replacement materials and labour costs that are required to complete the repair. TTG notes that properly installed products have passed wind blow-off tests in winds up to 110 mph, and have a Class 4 impact resistance as determined under the UL 2218 Testing Protocol. Thus, damage from wind and impacts is unlikely to occur except in extreme conditions.

In the event of a covered claim, TTG will cover the cost of labour to effect the repair and/or replacement of the Products up to a maximum of £222/€270 per 9.3 square meters of replaced Products specifically including any and all charges for tear‐off, disposal and/or skips, (the “labour costs”) for up to the first 93 square meters of affected Product. Thereafter, TTG’s liability for labour costs shall not exceed £64/€77 per 9.3 square meters for any remaining square meters of affected Products. In no event shall TTG pay any amount in excess of £222/€270 per 9.3 square meters toward labour costs for the first 93 square meters or £64/€77 per 9.3 square meters toward labour costs to repair or replace any additional square meters of affected Product. The claimant shall bear complete responsibility for establishing to TTG’s reasonable satisfaction the number of squares involved in any claim, the ultimate determination of which shall be made solely by Tapco. TTG may require that the claimant allow an inspection to determine both the nature of the defect, if any, and the size of the affected area. In any event, TTG reserves the right, at its sole option, to refund the amount paid by the original owner for the defective product in lieu of paying for the repair or replacement of the same.

This warranty does not provide protection against any failure, defect or damage caused by situations and events beyond the control of TTG, including but not limited to any misuse, abuse, neglect, improper handling or storage, failure to follow TTG’s installation instructions and guidelines, any damage resulting from fire, earthquake, flood, lightning, hurricane, tornado or other casualty or act of God. Discolouration and variations in colour or uniformity caused by weathering and/or UV exposure are not covered. Similarly, discoloration or staining due to shading or sap from trees, bushes, or plants or ash from chimneys is not covered. Likewise, discoloration caused by proximity of the products to copper, zinc or any other metal that might discolour will not be covered. This warranty will not cover any damages caused by insects, animals, algae or moss. It will not cover any damage done by chemicals, paints or other solvents. It does not cover damage resulting from any non‐traditional roof applications or any failure to meet local building regulations or to install adequate and balanced ventilation in the space below the roof on which the products are installed. It likewise, will not cover damages resulting from heat sources such as furnaces or air conditioners located in the space below the roof on which the products are installed. It will not cover damage resulting from drainage issues or roof slopes inconsistent with TTG’s installation instructions and specifications. This warranty will not cover damage resulting from installation of the product in temperatures less than 0°C. This warranty will not cover damage done while accessing the roof for construction, maintenance, or repair activities involving such items as chimneys, ventilation systems, satellite dishes, HVAC, etc. Damages resulting from vandalism and/or acts of war or civil unrest are excluded. This warranty does not cover any distortion or warping due to additional or unusual heat sources, including without limitation, window reflections, heat build-up caused by inadequate roof ventilation, and any other cause not involving inherent manufacturing defects in the material supplied by TTG. Finally, it will not cover any damages resulting from any other cause not involving manufacturing defects in the material supplied by TTG.

TTG notes that any repair or replacement panels may have a gloss or colour difference due to normal weathering and such difference is not considered defective.

Tapco Slate products are not warranted against discoloration or other damage caused by air pollution (including but not limited to metallic oxides or metallic particles), mildew, exposure to harmful chemicals, acid rain or normal weathering and fading resulting from exposure to the elements. Normal weathering is defined as exposure to sunlight and extremes of weather and atmosphere, which will cause any coloured surface to fade, chalk, or accumulate dirt or stains. The severity of any condition depends on the geographical location of the building, the cleanliness of the air in the area, and many other influences over which TTG has no control. This Warranty will cover fading in excess of four Hunter Units (as calculated according to ASTM D2244) beyond that which normal weathering would cause in the locale in which the installed products are located, if such fading occurs within the tenth anniversary of the purchase date if it is reported to TTG during that timeframe in accordance with the notice provision contained in the “Customer Responsibilities” portion of the warranty and subsequently verified by TTG. TTG shall have sole discretion to determine whether the product has faded beyond four Hunter Units as identified above. If the product is determined to have excessively faded, TTG shall refund the amount paid by the original owner for the excessively faded products, subject to the applicable proration as determined below.


This warranty gives you specific legal rights, and you may also have other rights, which vary from country to country or state to state. TTG reserves the right to discontinue any colour at any time.


If there is a change in ownership, the warranty may be transferred under the terms and conditions of this warranty to the new owner within the first five years after the original purchaser buys the product. The effective date of the warranty will remain the date of original purchase by the original property owner. The warranty cannot be transferred again. The new property owner shall be responsible for establishing this date at the time a claim is made to TTG’s reasonable satisfaction. In the event of a qualified transfer, the transferee shall be subject to the very same pro‐ration specification as was the original owner. That is, a permitted transfer shall not convey greater coverage on the transferee than was available to the original owner. In any event, coverage provided shall in no event be more than an amount equal to the original purchase price of any defective material, prorated as indicated in the Warranty Coverage Specification below to account for usage received. TTG must be notified in writing of any warranty transfer within 60 days of the closing of the sale to the new owner or the warranty shall be void. The warranty protection provided against excessive fading is not transferable from the original property owner.

Customer Responsibilities

The warranty claimant must promptly notify TTG (within 60 days) in writing of any manufacturing defect, hail damage, or excessive fading promptly following its discovery, and provide proof of the date of purchase, as well as proof of property ownership and/or an allowed transfer of ownership. To transfer rights under this warranty the transferee must send to TTG reasonable evidence of: 1) the transfer of ownership of the property from the individual who originally had the roof installed; 2) proof of the purchase date of the roofing material; 3) Proof that the transfer is taking place within 5 years of the original installation and 4) £64/€77 which is TTG’s fee to process the transfer. These items must be received by TTG within 60 days of the transfer of ownership of the property to the transferee of the warranty. Failure to do so within 60 days will void the warranty. This warranty may only be transferred one time within the initial 5 years after installation. That is, it may only be transferred by the individual owner who had the roof installed to the individual to whom he sells his home. It may not thereafter be transferred again. All notifications should be sent to:

Tapco Slate Roofing Products
Attn: Warranty Department
29797 Beck Road
Wixom, MI 48393

The owner may be required to submit a sample of any defective material to TTG for laboratory analysis. TTG will then investigate the claim and examine the material claimed to be defective. If a defect covered by this warranty is confirmed, TTG, within a reasonable amount of time after the inspection, will satisfy its obligations under this warranty.

Warranty Pro­-Ration Specification

Date of Purchase through seventh anniversary of purchase date 100% of recoverable labour and product costs as specified in warranty.

After seventh anniversary date through 50th anniversary date Claimant will be paid an amount equal to the number of months remaining until the 50th anniversary of the date of purchase to the nearest month divided by 600 multiplied by the original cost of the Products. The warranty payment amount may be determined from the following equation:
(600 - number of months remaining of 50 year period) x original cost of Products = warranty payment
After 50th anniversary date 10% of recoverable costs as specified in the warranty

1 This warranty is effective April 1, 2009 and supersedes all previously distributed versions of this warranty. It shall remain effective until such time as TTG publishes a subsequent superseding version at which time it shall have no further effect.

Contact us today to discuss your individual requirements, your project ideas and to arrange a free quotation. Alternatively you can call us direct on 0191 581 6881, or visit our showroom.

Seaham Windows, Doors & Conservatories
61 The Avenue, Seaham, County Durham, SR7 8NS
T: 0191 581 6881
F: 0191 581 6609