Address: 3540 Chestnut Ave Concord, CA 94519 Phone: 925-412-4015 Category: Siding Contractor Description: Besides, the fiber helps to control the temperature inside depending on temperature outside and the cement gives strength, so your walls won’t be damaged by every little stone. But if there is any scratch or other lesion, it is easy to replace a single detail. As a contractor for James Hardie, you can rely on on Best Exteriors to help you meet your needs and expectations for siding installation and replacement in Concord, CA.