Slag wall at W end of Glanyravon is a Grade II listed building in the Neath Port Talbot local planning authority area, Wales. First listed on 4 November 1993. Wall.

Slag wall at W end of Glanyravon

WRENN ID
floating-brass-gilt
Grade
II
Local Planning Authority
Neath Port Talbot
Constituency
Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
Country
Wales
Date first listed
4 November 1993
Type
Wall
Address
Slag wall at W end of Glanyravon, Ystalyfera
OS grid reference
SN 767 082
Coordinates
51.75972, -3.78781
Source
Cadw listing

Also on this page: flood risk · radon risk · weather exposure · detailed attributes ↓

Description

The structure is a wall made of coarsed slag blocks, featuring copings of larger irregular blocks. It stands about 1.7 meters high and is approximately 30 meters long.

Local climate

Slag wall at W end of Glanyravon sits in one of the wettest parts of the UK, with an average of 1,490 mm of rain a year. This makes it wetter than 98% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 95% of listed buildings.

It experiences an average of 43 freeze-thaw cycles a year, more than 81% of listed buildings. Of these, 21 follow at least 1 mm of rain in the preceding 48 hours. Average temperatures at this location have risen by 0.3°C per decade since 1991.

Averages for 1991–2020; temperature trend 1991–2025. Figures describe the wider area (a grid cell of roughly 10 km), not the individual site. Contains modified Copernicus Climate Change Service information 2026.

More on this building

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  • Detailed attributes — period, style, materials, features
  • Flood risk assessment
  • Radon risk assessment
  • Weather exposure and heating demand — rain and frost month by month and year by year, wind direction, solar and humidity
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