roofing slate การใช้

• It has started producing roofing slates for the area's historic houses.
• The Romano British site has been the site of surface finds of tesserae, roofing slates and pottery.
• Phonolites can be separated into slabs of appropriate dimensions to be used as roofing tiles in place of roofing slate.
• The valley was historically dependent on the roofing slate industry and it suffered from its decline from the 1960s onward.
• It resists fine splitting, so most of the mines'product was large cut slabs rather than split roofing slates.
• Also in 1948, squared stones were found along with limestone roofing slates that had medieval-style drilled nail-holes.
• Roofing slate is still in use, primarily for the restoration of eighteenth and nineteenth century buildings, as it is fairly expensive.
• The slate was not really suitable for the production of roofing slates, and so most of its early products were slate slabs.
• He saw it as a source of roofing slates to go with the ridging that Parc produced, and set about reopening it.
• The Greaves Welsh Slate Company produces roofing slates and other slate products from Llechwedd, and work also continues at the Berwyn Quarry near Llangollen.
• Over the next two days naval bombardment only dislodged some roofing slates, but the castle's guns caused casualties among the galley rowers and the land army.
• It contains the highest quality slate of the three veins and the most commercially valuable, being easy to split into roofing slates and slabs and both durable and strong.
• Asbestos roofing slates were substituted for the original wooden shingles in 1908, and an earlier weatherboarded and buttressed spire was replaced by the present structure in the same year.
• With crow steps, the roofing slates ( rarely tiles ) do not reach the end of the building, so making for a special problem with keeping the roof watertight.
• The first dressing mill, where the blocks of slate were split and dressed to form roofing slates, was situated on the eastern shore of Llyn Cwmorthin, and was known as Lake Mill.
• Fortunes revived in the early 1890s but towards the end of the century the accessible supplies of more profitable roofing slates at Ratgoed were running dry and the owners attempted to sell the business in 1897.
• Since 1994, the Fell community, aided by public support ( including grants by the European Community ), has restored two former roofing slate mines in Fell and converted them into an exhibition mine.
• Craig Ddu continued in operation until the end of the 1930s and the outbreak of WWII . It re-opened briefly during the war, to supply roofing slates for the repair of blitzed housing.
• A local landmark due to its high visibility when approaching the island by sea, the building is now in a serious state of disrepair, with roofing slates missing and the dovecote in danger of collapsing.
• Quarries in this region of the country remained active throughout the first quarter of the 20th century producing roofing slate, slate for electrical uses, as well as being the largest producer of school slates and chalkboards in the country.