Q: How many roof slates do I need per square metre (m2)?
A: The amount of slates you need per square metre (m2) depends on which slate size you’re using. For example, if you’re using a 20×10 slate (500mmx250mm), you will require 21 slate per m2. A 24×12 slate (600mmx300mm) demands only 13 slate per m2. These figures tend to be slightly different throughout the industry, but we, along with all of our roofing merchants, believe the following figures to be the most accurate.
- 16×8 (400mmx200mm) = 29 slate per m2
- 16×10 (400mmx250mm) = 27 slate per m2
- 18×10 (450mmx250mm) = 23 slate per m2
- 20×10 (500mmx250mm) = 21 slate per m2
- 24×12 (600mmx300mm) = 13 slate per m2
If you know the surface area of your roof, you can use our simple Roof Slate Calculator to give you the exact amount of slates you require to complete the job.
Please Note: These figures do not allow for any wastage, therefore we recommend adding a further 5%-10% on top of your order to account for this.
Q: What is pyrite in roofing slate?
A: Quite simply, Pyrite is an iron sulphide that can be found on the surface and within roofing slates. It is widely misunderstood that the presence of pyrite means the slate is of low quality. In our experience and with our knowledgeable sourcing, a certified A1-S1-T1 roofing slate with noticeable pyrite inclusions may change appearance slightly as opposed to leaching out from within the slate. Stable Pyrite doesn’t affect the structural integrity of the slate provided you have certification to prove the rock’s overall quality and performance requirements.
Q: Is Chinese roof slate good in comparison to Spanish or Welsh?
A: We’ve heard and seen the horror stories of certain Chinese slates in the past, we’ve also seen our fair share of poor Spanish and Welsh slates. It all boils down to who you’re buying from, and where the rock is sourced. Our Chinese slate is quarried in South East China, where the rock is beautiful to work with, splits easily – resulting in slates of uniform thickness, and presenting minimal pyrite. There are virtually no noticeable pyrite inclusions in our Chinese Emperor slates. If your Chinese Slate has the certification to prove it’s an A1-S1-T1 slate (which ours do) then there is no logical reason to dismiss the Emperor slate with it’s traditional cut edges and flat even split.
Q: What’s a good alternative to Welsh Roof Slate?
A: This begs 2 questions: 1) A good alternative in terms of quality? 2) a good alternative in terms of appearance? If you’re after something that’s going to outlive the rest of your house, then we’d recommend any of our certified A1-S1-T1 slates, but in particular the GM Ultra, Prestige or the Prime. If you are looking for something that’s similar to the Welsh in terms of traditional appearance, then we’d recommend the Chinese Emperor (our biggest seller to Wales) or, again, the GM Ultra for a modern almost contemporary finish.
Q: “Why should I buy from you?”
A: We’ve established ourselves as one of the most reliable and efficient slate suppliers in the industry. We are also known for the cheapest rates for roofing slates throughout the UK.
Q: How are you able to offer slates at such low rates?