Wood cupping
Wood cupping describes where a plank or piece of wood bends across it with or across its grain and is the impact of shrinkage. When wood is observed in cross secrion wood cuts normally cup in the opposite direction to the flow of growth rings.
This characteristic may be used to its advantage for example where two layers of wood planks are used as roof sarking or vertically in fencing. In a roof the outermost planks are laid to cup downwards, whilst the layers beneath are laid to cup upwards, this causes the plank curves to tighten against each other over time, thus creating a better seal for the roof face.
[edit] Related articles on Designing Buildings
- Carpentry.
- Facts about forestry.
- Janka hardness rating scale.
- Nails - a brief history.
- Sustainable timber.
- Staircase.
- The differences between hardwood and softwood.
- The use of timber in construction.
- Timber.
- Timber vs wood.
- Types of timber.
- Types of timber species.
- Whole life carbon assessment of timber.
- Wood around the world.
Featured articles
Check out some of the best features and news from Designing Buildings as well as key stories from around the web.
Where performance meets practice
The Building Envelope Stage at UKCW Birmingham.
CIAT publishes briefing on planning reforms.
Leaders in Learning for Practice Network
Call for conservation leaders in learning to register interest in new network.
The importance of early engagement
Construction lessons from the Trillium HealthWorks Experience Centre.
Mayors are to be given planning call in powers
Mayors across England will be able to make the most important planning decisions.
The Master Builder: William Butterfield and his times. Book review.
Why construction can't afford to ignore the skills gap.
Building Safety Regulator, 19 August
Gill Kernick appointed Independent Chair of Residents’ Panel.
Connecting knowledge, technology and conservation
Building competence for the future of built heritage.
Building Regulations and Building Safety Act
CIOB publishes free advice for non-domestic clients.
Building Safety Newsletter from MHCLG.
An extraordinary record of steel engineering worldwide.
Comments
[edit] To make a comment about this article, or to suggest changes, click 'Add a comment' above. Separate your comments from any existing comments by inserting a horizontal line.