- 761 - SECTION 920 – DAMPPROOFING
920.01 Description
1.The Contractor shall furnish ma terials and dampproof surfaces as shown in the contract.
920.02 Material Requirements
1.Priming coat:
a.When coal-tar pitch is used in dampproofing, the creosote primer shall conform to t he requirements of ASTM D 43.
b.When asphalt is used in dampproofing, the asphaltic primer shall conform to the requirements of ASTM D 41.
2.Mopping coat:
a.Coal-tar pitch, when used as a mopping coat in dampproofing, shall conform to the requirements of ASTM D 450.
b.Asphalt, when used as a mopping coat in dampproofing, shall conform to the requirements of ASTM D 449, Type II.
3.Materials for damproofing shall be approved based on a certificate of compliance from the supplier stati ng that they conform to the above requirements.
920.03 Construction Methods
1.All surfaces to be dampproofed shall be free from dust, sand, mud, mortar, and other deleterious particles. All grease spots or marks of oil shall be removed by washing with a rag dipped in solvent. All surfaces shall be allowed to dry thoroughly before applying dampproofing. Work may be started as soon as the forms are removed.
2.After the surfaces have been t horoughly cleaned and dried, they shall be uniformly coated with 1 coat of primer and 2 coats of hot asphalt or coal-tar pitch. The primer may be appl ied cold, but the asphalt or coal-tar pitch shall be applied with a mop at a temperature of at least 250°F (121°C). Dampproofing shall be performed only in dry weather and when the temperature is above 41°F (5°C). Each coating shall be allowed to dry before the next coating is applied.
3.The primer shall be applied in quantities sufficient to thoroughly cover the surfaces to be treated. The total dampproofing application shall be not less than 6 gallons per 100 square feet (2.5 L/m2) of horizontal surface and 5 gallons per 100 square feet (2.25 L/m2) on vertical surfaces.
4.Care shall be exercised to confine all dampproofing materials to the areas being treated and to prevent disfi gurement of any part of the structure by dripping or spreading of asphalt.
920.04 Method of Measurement
1.The dampproofing will be measured in square yards (square meters).
920.05 Dampproofing
- 762 - 920.05 -- Basis of Payment
1.P a y I t e m P a y U n i t Dampproofing Square Yard (SY) [Square Meters (m2)]
2.Payment is full compensation for all work described in this Section. - 763 - SECTION 921 -- MAILBOX POSTS
921.01 Description
1.The Contractor shall inst all and assemble mailbox posts and brackets. The Contractor will not be required to install the mailbox.
921.02 Material Requirements
1.The Department will furnish the posts, brackets, and fasteners. The Contractor will be required to pick up the post assembly at one of the permanent maintenance headquarters. (See Subsection 422.02).
921.03 Construction Methods
1.The post assembly shall be installed as shown in the contract. The Contractor will be required to use a fo llower block to protect the post during driving.
921.04 Method of Measurement
1.Mailbox posts are measured by the each.
921.05 Basis of Payment
1.P a y U n i t P a y U n i t M a i l b o x P o s t E a c h ( e a ) Remove and Reset Mailbox Each (ea) 2. Payment is full compensation for all work described in this Section.
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 795–796 of 1,048.