Get more from your slate investment.

Get more from your slate investment.

Today's slate roof — even better

A slight gap between roof slates brings many benefits.

a controlled, supported air gap

Let a modern understanding of stone decay and slate roof performance make your roof even better. Learn how a small air gap between slate surfaces:

  • Increases slate life (and that of the battens/roof deck) — reducing comprehensive cost
  • Increases ventilation — reducing condensation
  • Increases wind resistance
  • Reduces breakage
  • Sets a new sustainability standard

* The aging pattern shown to the right is typical of high grade slates,
   such as this one from the UK's Lake District.

   Other slates can show even more pervasive effects from lingering moisture.

Aging patterns teach.

Among the lessons:
When slate dries, aging stops.*

A preview of one benefit:

It is a surprising finding: Roof slate, known for long life, can last even longer. Clients can get an even better return on their investments.

By understanding how slates age, specifiers and installers can extend slate life, reduce comprehensive costs and set a new sustainability standard.


Close surfaces create capillary action

Capillary action traps moisture

Trapped moisture ages
front and back surfaces
Click to enlarge

First visit?  See an overview of all the benefits, here.


Learn how to reduce the comprehensive cost and improve the performance of your slate roof.

  • Learn how specifiers and installers can slow the rate of slate aging, add decades to slate life — and change the economics of slate use.
  • Learn how today’s slate roof can set a new sustainability standard.
  • Learn how each roof slate can act as a vent.
  • Learn how wind acts on roof slates — and what BRE uplift testing shows can be done to increase wind resistance.
  • Learn how to reduce a leading cause of slate breakage.

First visit?

Sustainability: The slate community is doing it's part

Owners, specifiers and installers are examining long-established practices as calls mount to increase the sustainability of their efforts. The artful balance is to preserve the tried and true, yet incorporate modern insights and sensitive refinements where warranted.

This effort reaches all corners of the built environment, from contemporary to traditional, from foundation to roof. The slate community is doing its part with ongoing refinements at the quarry, in the mill and on the roof.

This site describes one of these refinements. It examines, among other things, the straightforward but intimate mechanisms of stone aging, mechanisms that could not have been fully understood at the time that slatecraft evolved. It shows, remarkably, that despite its record of long life, slate can last even longer.

First visit?

Comment from the field

David Wallace Slate, Ltd.
Slate supplier

Some may not realize that slate roofs have evolved over the years. Examples include the use of certain stainless steel elements, certain fixings (such as hooks and repair clips), better vents and better underlays. SlateSpacer™ is another example. It carries the themes of ventilation and moisture control to a new level.

Increasingly, clients and architects are asking for more sustainable roof systems. SlateSpacer™ helps us to respond to these calls.

— MG

First visit?