The steel reinforcement is of immense importance in fireproof work, because, if properly designed, it enables the concrete to hold together and do its work even when it has been cracked by fire and water.
But they are weak, and modern experience goes to show that a strong concrete is the best, and that probably materials like broken clamp bricks or burnt clay, which are porous and yet strong, are far better than cinders as a fireproof aggregate.
In 2008, he did star in an independent film called Fireproof.
From it have been transferred to the fireproof building of the Registry of Deeds many interesting historical documents, among them the records of the Plymouth colony, the will of Myles Standish, and the original patent.
It contains, in addition to the ancient national records, adequate accommodation, in fireproof chambers, for all Scottish title-deeds, entails, contracts and mortgages, and for general statistics, including those of births, deaths and marriages.