by Fmeaddons

TapcoSlate Aledora

for that quality hand-cut slate look

If you seek the natural beauty of hand-cut, thick slate roofing, without the weight, TapcoSlate Aledora was made for you. Additionally, installation times of a synthetic slate roof are dramatically reduced. Aledora roofing slate incorporates the finest aesthetics and craftsmanship available in the synthetic slate industry, providing a hand-cut slate appearance for a fraction of the cost and weight. Like all Tapco Roofing Products, Aledora also delivers Class A Fire Rating, Class 4 Hail Impact Rating, 110-MPH Wind Uplift Rating, and a 40-year Warranty that will protect your top investment for many years to come.

  • TapcoSlate Aledora tile moulds are an exact replica of quality natural roofing slates. Stone cleavage and unique edges are replicated exactly under intense pressure when manufacturing our durable roofing slates and shingles.
  • Available in S-Series (12″ tile width).
  • Lightweight – as low as 8.35kg per square metre.
  • Easy to install with pre-marked nailing and exposure guides and spacers.
  • Easily cut with a fine-toothed saw or sharp utility blade.
  • No sorting, clipping, or drilling prior to roof loading. Packaged in bundles of 24 for easy handling.
  • Fittings (ridges and hips) are mechanically fixed.
  • Choice of colours (special order only).
  • Non-repeating staggered or straight application.
  • 40-year warranty.
  • TapcoSlate Aledora is not made from recycled plastics but is manufactured from recyclable virgin limestone and polypropylene.
Want a more TRADITIONAL slate look? Then check out our market-leading
TapcoSlate CLASSIC product


Ideal for New Build, Self-build, Renovation, Extensions, Conservatories, and Garden Rooms

New Aledora Slate S-Series takes authenticity to unprecedented heights to deliver a realistic look that has not been possible before. Aledora S-Series is available in 12″ (305mm) wide tiles for an authentic, consistent slate appearance. Aledora offers crisp, jagged edges to mimic the look of slate, creating shadow variance. Aledora integrates multiple colors into every tile, showing variations matching the hues of natural slate. Each tile is uniquely beautiful, so no two roofs are identical. Aledora’s lighter weight makes installation easy.

TapcoSlate Aledora Mixes are another feature of our unique colour choices, they deliver uncommon elegance through boldly-appealing multiple colours to turn your roof into a work of art.

Ask about obtaining a FREE sample tile today and see for yourself why more and more people are turning to synthetic slate!

Please note that TapcoSlate Aledora is available as special order only, contact our sales team for further information.

Depending on lighting conditions, our roof tiles will reflect varying levels of color intensity. Actual colors may vary from those shown on the screen, free samples are available on request.

TapcoSlate Aledora Roofing Accessories




Q. How is it fixed?

A. Galvanised steel nails or outdoor screws driven through the slate, either manually or by nail/screw gun. No drilling, clipping or hooks required.

Q. How many are needed. What’s the coverage?

A. Depends on the pitch of the roof, please see our Measuring Guide tab.

Q. How shallow a pitch can they be used on?

A. 14 degrees. This is very useful for extensions and other applications where the available roof slope may be limited.

Q. Is an eaves (soldier course) needed?

A. Yes. Standard slating principles apply.

Q. How are the ridges/hips fixed?

A. Nailed/screwed in situ and overlapped. Dry-fix system much more secure than a bedded ridge. Cement does not adhere well to TapcoSlate Aledora.

Q. Is it colourfast or does it fade or go white?

A. No TapcoSlate Aledora is UV stable and through coloured. It will weather, as does any roof covering, depending on location and exposure.

Q. How is it cut?

A. Fine-toothed saw, disc cutter, or it can be scored with a utility knife.

Q. Will moss/algae grow on TapcoSlate Aledora?

A. Once again, this depends on the location and exposure of the site. Algae grows better on a laminar material, TapcoSlate Aledora is not laminar. To deter growth, string a copper wire across the length of the ridge.

Q. Is it a “green” recycled product? What’s it made from?

A. It’s not recycled… but it’s RECYCLABLE. TapcoSlate Aledora is made from limestone and virgin resins. Consequently there is greater control over the mix and the manufacturing process. The main problems experienced with using reclaimed inconsistent raw materials are due to the lack of control in the manufacture which can result in splitting, curling, etc. There are no such problems with TapcoSlate Aledora.

Q. How is it packaged/delivered?

A. Individually strap-banded bundles of 25 slates… 1152 per pallet (or less). There is a delivery charge depending on location.

Q. Can it be used for vertical cladding?

A. Yes.


Download our Product Brochure
Download our Fixing Guide
Download our Warranty
Download our TapcoSlate Fire Safety Report Part 1
Download our TapcoSlate Fire Safety Report Part 2
Download our LEED Specification
Download our Wind Performance
Download our Chemical Compatibility
Care and Maintenance of your TapcoSlate Roof



Please note: TapcoSlate, TapcoShake, and Tapco Roofing Products are known as the InSpire Roofing Products line in the USA. Installation techniques differ between the US and other countries, please view our Installation Guide for UK techniques.


When you contact us, our representative will guide you as to how many TapcoSlate Aledora units you will need to cover your roofing project. TapcoSlate Aledora S-Series comes in a fixed tile width of 12″ or 305mm (similar to our Classic range). However, the general idea is to measure how many square metres your roof covers and what pitch (and therefore which gauge) your roof is. The TapcoSlate Aledora tile has 5 gauge markers, the 6″ (153mm) gauge is for roof pitches of 14 to 22.5 degrees, and the 6.5″, 7″, 7.5″ and 8″ (165mm, 178mm, 191mm and 203mm) gauge markers are for 22.6 degrees to a 90 degree (maximum) pitch. These are the only stipulations on roof pitch, the gauges 6.5″ and above are to help with the aesthetics of your roof, you can decide how you want your roof to look.  The gauge that you set your tiles to affects the numbers of slates that will fit to your roof, the following table explains how this is calculated (based on the use of a ½” (13mm) gap between the slates):

14* to 22.5 degrees (fully boarded or felt & battens)6" (152mm)21
22.6 to 90 degrees (fully boarded or felt & battens)6.5" (165mm)20
22.6 to 90 degrees (fully boarded or felt & battens)7" (178mm)18
22.6 to 90 degrees (fully boarded or felt & battens)7.5" (191mm)17
22.6 to 90 degrees (fully boarded or felt & battens)8" (203mm)16

* The minimum recommended pitch and lap may be influenced by special circumstances, please contact our technical department for advice.
Note: Advice from our technical department should also be sought when installing on high buildings and/or in exceptionally windy areas.


Roof pitch (slope really, but it is known as pitch) refers to the amount of rise a roof has compared to the horizontal measurement of the roof. The picture opposite shows the pitch of a 7:12 roof slope meaning that for 12″ of horizontal measurement (roof run) the vertical measurement (roof rise) is 7″. This measurement is best done on a bare roof, but If this isn’t practical then perform the same measurement on the underside of the roof (loft).

So what does the 7:12 in the example to the right mean? The 7 means that the roof rises 7″ for every 12″ it runs, simply mark a level at 12″, hold it perfectly level and measure from the roof surface to your 12″ mark, this will give you the rise. To convert this measurement to degrees, please see the table below:

Roof Pitch – Rise and Degrees
Roof Pitch – Rise and Degrees


Each TapcoSlate is marked with a fitting gauge which is determined by the Roof Pitch (see above). The gauge is pictured on the right. How many slates you need to cover your roof per square metre depends on the gauge and increments according to your roof pitch.

Once that you have the first layer of slates on your fully boarded roof, the next layer (and onwards to the ridge) should be layered on top. The gauge, on both sides of the slate, is then placed onto the very top of the laid slate and moved up or down according to your roof pitch. The gauge has 5 markers – 6″ (14 to 22.5 degree pitch), 6.5″, 7″, 7.5″ and 8″ (over 22.5 degrees to 30 degree pitch). On TapcoSlate Aledora, these are the only stipulations on roof pitch, the remaining gauges are to help with the aesthetics of your roof, you decide. Please note, however, the above table representing how many tiles are needed per square metre at any particular gauge as this does make a difference.


A square metre is a metric measurement of area. If the area involved in your roofing project is square or a rectangular, measure the length and width of the area, using a metric tape measure or a meter stick. Multiply the length, in metres, times the width, in metres. That will give you the area of the square or rectangle in square metres.

If the area involved is not square or rectangular, sketch the area to scale on a piece of graph paper. You can make sure that it is to scale by allowing each division on the grid to equal a certain number of metres. Break up the sketch into rectangles, squares, triangles, and even circles, if necessary. Apply the appropriate metre-based formulas to each shape on the graph to determine the area of each shape in square metres. Multiply length times width for squares and rectangles. Multiply base times height and divide by two for triangles. Measure from the centre of a circle to its outer edge to find the radius; then multiply the radius times itself and multiply that figure by 3.14, which is “pi.” Add the areas of each shape to find the square metres of the entire area.

To recap, if your roof is 8 metres high by 10 metres long, this equals 80 square metres, times this by 2 sides of the roof equals 160 square metres in total. If your roof is 24 degrees, and therefore the TapcoSlate Aledora gauge can be set to 6.5″, 7″, 7.5″ and/or 8″, so let’s set at 7″ increments, at this gauge you will fit 18 TapcoSlate Aledora S-Series (fixed tile size) to every square metre – 160 x 18 – you will therefore require 2880 TapcoSlate Aledora in total. TapcoSlate Aledora are bundled in packs of 24 and so you will need 120 bundles. Please note that you will also need a starter or eaves course. TapcoSlate Aledora has a special starter or eaves course tile, 3.25 tiles per linear metre, so in this example you would also need to cover 2 x 10m = 20 linear metres, times 3.25 tiles per metre = 65 starter tiles. These are sold in bundles of 24 so you will need 3 bundles (in total 72 starter tiles would then be ordered).

Please Note: The details on this page are for guidance only, and the Tapco Group will not be held responsible for any incorrect measurements undertaken by you or your architect or roofing contractor. It is your sole responsibility to ensure that any measurements and quantities ordered are correct.


CONSTRUCTION:Manufactured from a recyclable blend of limestone and polypropylene.
SIZE (SLATE):18” x 12” (457mm x 305mm)
WEIGHT (SLATE):0.52 kg
WIDTH (SLATE):0.40” (10mm) at the thickest part front edge, 0.2" (5mm) at the thinnest part top edge.
SIZE (RIDGE CAP):5.9” x 17.5” (150mm x 445mm)
GAUGE:6” at 14° to 22.5°
6.5”, 7”, 7.5”, and 8" at 22.6° to 90° (these gauges over 22.6° are used for aesthetics only).
Please also see coverage/gauge table on the Measuring Guide Tab above or the Fixing Guide
COVERAGE (SLATE):6" exposure (S-Series):
12" width slate = 21 slates m²
6.5" exposure (S-Series):
12" width slate = 20 slates m²
7" exposure (S-Series):
12" width slate = 18 slates m²
7.5" exposure (S-Series):
12" width slate = 17 slates m²
8" exposure (S-Series):
12" width slate = 16 slates m²

Please also see coverage/gauge table on the Measuring Guide Tab above or the Fixing Guide
COVERAGE (RIDGE CAP):5.5 per linear metre
COVERAGE (HIP):5.5 to 6.5 per linear metre (depending on gauge)
Pallet: 1152 Slates (0.65 tonnes)
Bundle: 24 slates (13.6 kg)
FIXING:Large-headed galvanised 1.2” (30mm) by 0.1” (2.5mm) steel nails (using hammer or nail-gun), or Phillips bugle outdoor screws. Aluminium or copper nails may also be used, but driving them through the slate may cause bending. Longer 3” (76mm) nail required for fixing ridges and hips.
CUTTING:Fine-toothed handsaw, jigsaw, circular saw, or sharp utility blade.
STORAGE/TEMPERATURE:TapcoSlates should not be stored on roof decks in such a manner as to over-stress and/or damage the deck and supporting structure.
Cold Weather Installation: TapcoSlates should be stored in original packaging in a storage facility where the temperature meets or exceeds 7°C. Use protective coverage over all pallets while being temporarily stored on-site. TapcoSlates must be conditioned at a temperature no lower than 7°C for twenty-four (24) hours prior to use. TapcoSlate may be installed at temperatures as low as 0°C but must be hand fastened, the use of a pneumatic gun below 7°C will result in cracking and webbing in the fastened area. Be sure to follow the manufacturer’s installation requirements for all underlay or membrane and any other applications. Comply with any and all local building regulations. Note of Caution: The slates can be slippery under certain conditions and job site safety procedures should be enforced.
ACCELERATED ULTRA VIOLET EXPOSURE:In accordance with ASTM G154 Xenon Arc Chamber 9,500+ hours. Tile exhibited virtually no fade and with no trace of cracking, spalling or deformation.
FREEZE-THAW CYCLE:In accordance with ASTM C666/C666M. No signs of damage or cracking after 300+ cycles.
WATER ABSORPTION:In accordance with ASTM C272. No appreciable weight gain.
WATER PERMEATION:In accordance with ASTM E96/E96M. Tile shown to be impermeable
TEMPERATURE CYCLING:No signs of cracking, curling, deformation, or visible expansion.
WARRANTY:40-years. Please see our Warranty Document for further information.


FIRE RATING:In accordance with UL790 / ASTM E108. Class A.
HAIL RATING:In accordance with UL2218. Class IV.
WIND DRIVEN RAIN & WIND UPLIFT:In accordance TAS 100-95; UL 580. Up to 110 mph. No water infiltration through sheathing. No tiles blew off, tore or blew upward.
FLORIDA BUILDING CODE:FL#7409, FL#16269, FL#16856; ICC ESR-2745.