2018-068-E AMS - Heritage Restoration Norwood Jones

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DocuSign Envelope ID: 6D579320- 4489 -45FE- 8100- 9D5FB44BF780 2 Norwood -Jones Law Office Brickwork Restoration Project Court Street, Hillsborough NC Mortar: The Contractor will provide and use only Heritage Lime Putty Mortar, Type L as manufactured by US Heritage Group, Chicago, IL. Color to be derived from mortar analysis. Scaffolding: The Contractor shall provide scaffolding where required. The Contractor shall coordinate the placement of scaffolding along the south elevation, in the right -of -way of Margaret Lane, working with the Town of Hillsborough and the Owner to ensure safe conditions for pedestrians, motorists and workers at all times. Cleaning: the Contractor may clean the brickwork prior to carrying out the repointing work, using the gentlest possible methods. The proposed cleaning method must be tested in an area selected by the Owner and Contractor, then reviewed and approved prior to cleaning entire building. Curing, wetting and drying: All aspects of the repointing must be planned to avoid the rapid drying out of the newly repointed mortar joints to allow for proper carbonization and curing, as outlined in the attached repointing guide. The bricks must be pre -wetted prior to repointing but no standing water should be present. Do not expose the repointed areas to the direct sun during hot weather; hang sun- shielding tarps or otherwise protect the new mortar joints from the drying effects of the sun for at least 72 hours after repointing. The Contractor shall mist the completed areas to wet then allow to dry, then mist again, for a full treatment of 9 wet /dry cycles over 3 days, as specified in the in the "Masonry Restoration: Lime Putty & Hydraulic Mortar Repointing Guide" Identifying Weathered or Deteriorated Mortar Joints: The Contractor shall inspect all mortar joints to identify those that have weathered back from the face of the brick to a distance of 1/2" depth or greater. Any weathered joints should be inspected and probed for soundness. Any joints that are soft or exhibit powdery mortar conditions should be raked out or cleaned out to a depth of 3/4" to 1" as described in "Masonry Restoration: Lime Putty & Hydraulic Mortar Repointing Guide" and "Heritage Lime Putty Mortar Type L Product Data Sheet" by US Heritage Group. Modern Mortars: A few areas of the brickwork were repointed with modern repointing mortar and show some joint failure. These areas should be examined for soundness. Check each area and remove only the mortar that comes out readily, and without damage to the historic brickwork. Brick Replacement: Any soft, extremely deteriorated bricks shall be identified. These shall be carefully cut out of the walls and replaced with hard -fired bricks of the same size and color. Replacement bricks for this use shall be reviewed and approved by the Owner. Great care should be taken to match both size and color as closely as possible. Removal of these bricks shall be undertaken with great care to avoid causing damage to the surrounding sound bricks. For ease of removal, use large diameter masonry bits to bore holes in the soft brick to be removed, then use hand chisels to remove broken up pieces. Chimney Repairs: The chimney brickwork is presently deteriorated and unstable. Remove bricks down to where the mortar is still intact and rebuild using all of the original bricks, taking care to replicate the existing bonding patterns and joint widths. New Chimney Cap: Install a new "invisible" chimney cap of copper or stainless steel to protect chimney from future deterioration. Bring edges of cap right to edges of brickwork. Use clear high quality silicone sealant to seal all edges of the cap.