Structural Retrofits a. The installation of the following retrofits/upgrades, provided that such upgrades are not visible on the exterior: attic bracing, cross bracing on pier and post foundations; fasteners; collar ties; gussets; tie downs; strapping and anchoring of mechanical, electrical, and plumbing equipment; concealed anchoring of furniture; installation of plywood diaphragms beneath first floor joists, above top floor ceiling rafters, and on roofs; and automatic gas shut off valves.
b. Replacement, repair or installation of lightning rods.
Structural Retrofits a. The installation of the following retrofits/upgrades, provided that such upgrades are not visible on the exterior: attic bracing, cross bracing on pier and post foundations; fasteners; collar ties; gussets; tie downs; strapping and anchoring of mechanical, electrical, and plumbing equipment; concealed anchoring of furniture; installation of plywood diaphragms beneath first floor joists, above top floor ceiling rafters, and on roofs; and automatic gas shut off valves. In masonry structures, bolts will be required to be installed through the mortar and not the stone or brick, as applicable.
b. Replacement, repair or installation of lightning rods.
Structural Retrofits. 1586
1587 a. The installation of the following retrofits/upgrades, provided that such upgrades are 1588 not visible on the exterior: attic bracing, cross bracing on pier and post foundations; 1589 fasteners; collar ties; gussets; tie downs; strapping and anchoring of mechanical, 1590 electrical, and plumbing equipment; concealed anchoring of furniture; installation 1591 of plywood diaphragms beneath first floor joists, above top floor ceiling rafters, and 1592 on roofs; and automatic gas shut off valves. 1593
1594 b. Replacement, repair or installation of lightning rods, provided they are not historic, 1595 character-defining features. 1596
Structural Retrofits a. The installation of the following retrofits/upgrades, provided that such upgrades are not visible on the exterior, or visible on the interior in character defining spaces: attic bracing, cross bracing on pier and post foundations; fasteners; collar ties; gussets; tie downs; strapping and anchoring of mechanical, electrical, and plumbing equipment; concealed anchoring of furniture; installation of plywood diaphragms beneath first floor joists, above top floor ceiling rafters, and on roofs; and automatic gas shut off valves.
b. Replacement, repair or installation of lightning rods.
Structural Retrofits a. Installation of the following retrofits/upgrades, provided that such upgrades are not visible on the exterior: attic bracing, cross bracing on pier and post foundations; fasteners; collar ties; gussets; tie downs; strapping and anchoring of mechanical, electrical, and plumbing equipment; concealed anchoring of furniture; installation of plywood diaphragms beneath first floor joists, above top floor ceiling rafters, and on roofs; and automatic gas shut off valves.
b. Replacement or repair of lightning rods.
c. Installation of new wheelchair ramp on the front or other entrance of a structure visible from a public right-of-way, in a manner that does not remove, compromise or damage the existing historic materials or features and would be completely reversible without damage to historic fabric. This Allowance only applies to residential structures.
d. Installation of new wheelchair ramp on side or rear entrance of a structure, when not visible from any public right-of-way. This Allowance only applies to residential structures.
Structural Retrofits a. The installation of the following interior retrofits/upgrades, provided that such upgrades are not visible on the exterior: attic bracing, cross bracing on pier and post foundations; fasteners; collar ties; gussets; tie downs; strapping and anchoring of mechanical, electrical, and plumbing equipment; concealed anchoring of furniture; installation of plywood diaphragms beneath first floor joists, above top floor ceiling rafters, and on roofs; and automatic gas shut-off valves.
b. Replacement, repair, or installation of lightning rods.
c. Interior earthquake bracing used on refrigerators and against-the-wall shelving in schools and other public buildings.
Structural Retrofits. 1629
1630 a. The installation of the following retrofits/upgrades, provided that such upgrades are not 1631 visible on the exterior: attic bracing, cross bracing on pier and post foundations; 1632 fasteners; collar ties; gussets; tie downs; strapping and anchoring of mechanical, 1633 electrical, and plumbing equipment; concealed anchoring of furniture; installation of 1634 plywood diaphragms beneath first floor joists, above top floor ceiling rafters, and on 1635 roofs; and automatic gas shut off valves. In masonry structures, bolts will be required to 1636 be installed through the mortar and not the stone or brick, as applicable. 1637 1638 b. Replacement, repair or installation of lightning rods. 1640 c. Earthquake bracing used on refrigerators and against-the-wall shelving in schools 1641 and other public facilities. 1642
Structural Retrofits a. The installation of the following retrofits/upgrades, provided that such upgrades are not visible on the exterior: attic bracing, cross bracing on pier and post foundations; fasteners; collar ties; gussets; tie downs; strapping and anchoring of mechanical, electrical, and plumbing equipment; concealed anchoring of furniture; installation of plywood diaphragms beneath first floor joists, above top floor ceiling rafters, and on roofs; and automatic gas shut off valves. In masonry structures, bolts will be required to be installed through the mortar and not the stone or brick, as applicable.
b. Replacement, repair, or installation of lightning rods.
c. Earthquake bracing used on refrigerators, against-the-wall shelving, or any free- standing furniture in schools and other public facilities. Work will be performed in accordance with NPS Preservation Brief #41, The Seismic Rehabilitation of Historic Buildings. xxxxx://xxx.xxx.xxx/tps/how-to-preserve/briefs.htm
d. Activities related to flood proofing and minor upgrades on secondary facades. A secondary façade is a façade that does not face a public thoroughfare, mews, or court and that does not possess historically significant architectural features. Minor upgrades may include replacement of exterior utilitarian, non-character-defining doors or windows with new doors or windows, the addition of new elements (such as storm panels or flood panels) to exterior doors or windows, and the installation of metal grating at basement window xxxxx. The National Park Service (NPS) publication Flood Adaptation for Rehabilitating Historic Buildings provides guidance about how to adapt historic buildings to be more resilient to flooding risk in a manner that will preserve their historic character. xxxxx://xxx.xxx.xxx/orgs/1739/upload/flood-adaptation-guidelines-2021.pdf
Structural Retrofits. 15 a. The installation of the following interior retrofits/upgrades, provided that such 16 upgrades are not visible on the exterior: attic bracing, cross bracing on pier and 17 post foundations; fasteners; collar ties; gussets; tie downs; xxxxxxxxx and 18 anchoring of mechanical, electrical, and plumbing equipment; concealed 19 anchoring of furniture; installation of plywood diaphragms beneath first floor 20 joists, above top floor ceiling rafters, and on roofs; and automatic gas shut-off 21 valves.
22 b. Replacement, repair, or installation of lightning rods.
23 c. Interior earthquake bracing used on refrigerators and against-the-wall shelving 24 in schools and other public buildings.
Structural Retrofits a. The installation of the following retrofits/upgrades, provided such upgrades are not visible on the exterior: attic bracing; cross bracing on pier and post foundations; fasteners; collar ties; gussets; tie downs; strapping or anchoring of mechanical, electrical, and plumbing equipment; concealed anchoring of furniture; installation of plywood diaphragms beneath first-floor joists, above top-floor ceiling rafters, or on roofs; and automatic gas shut off valves. In masonry structures, bolts will be required to be installed through the mortar and not the stone or brick, as applicable.
b. Replacement, repair, or installation of lightning rods.
c. Earthquake bracing used on portable equipment and shelving in schools and other public facilities.
d. Activities related to flood proofing and minor upgrades on secondary facades. A secondary façade does not face a public thoroughfare, mews or court and does not possess historically significant architectural features. Minor upgrades include replacement of exterior utilitarian, non-character-defining doors or windows with new doors or windows, the addition of new elements (e.g. storm panels or flood panels) to exterior doors or windows, or the installation of metal grating at basement window xxxxx.
