HEATING, VENTILATING AND AIR CONDITIONING DUCTWORK (HVAC)

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This procedure establishes the method for inspection and verification that construction work on HVAC ductwork systems and sub-systems are acceptable.

PROCEDURE HEATING, VENTILATING AND AIR CONDITIONING DUCTWORK

Verify Ductwork Configuration:

–           Identify the specific limits of the system/sub-system to be inspected. Obtain the latest approved revision of the drawings of the system/sub-system for verification of the work to be inspected.

–           Verify that the installed configuration of the ductwork and hangers conforms to the drawings. Hangers and supports should be observed to assure the presence of all members. Ductwork should be observed to assure installation is within allowable tolerances for line and elevation. If there are any field “trim joints” that have not been previously inspected for acceptable completion and welding, they should be checked at this time.

Please read aslo: PROCEDURE FOR CONCRETE WORK-CIVIL

Verify Ductwork Integrity:

–           Ductwork should be checked internally by means of the access doors to assure that it is free of obstructions such as construction debris, scrap, etc. which is to include the checking of fire dampers for obstruction. When this has been determined, the door shall be closed and sealed with an acceptance tag, in a manner that will require the tag to be broken to gain access. Use of the tag seal is intended to provide protection against unauthorized access to the ducts.

–           Verify that any internal field-installed accessories, such as dampers, are in place. Inspections prior to release for testing shall verify that openings in the ductwork are closed or fitted with temporary blank-offs as required to establish the pressure boundaries for leak testing.

Verify Leak Testing Performed

–           Verify that leak testing has been performed and that leakage rates are within allowable limits. The integrity of duct joints shall be confirmed via leak testing. After leak testing, verify that all temporary blank-offs are removed.

Verify Connections to Equipment

–           Verify that all external field-installed accessories, such as registers, grills and diffusers are in place. Verify that any required connections to equipment are complete and in accordance with the drawings.

FORMS REQUIRED

  Quality Control Forms

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 Buildings Air Conditioning Checklist

ROOFING INSPECTION CHECKLIST Form No.
AREA:                                                  BUILDING:                                           

DATE:                                                   TIME:                                                  

WEATHER:                   o Sunny                        o Cloudy           o Rainy             o Foggy

TEMPERATURE:                       °F         DEWPOINT:                  °F
Inspection Attribute Acceptable Remarks

General Requirements

 

1.     Decking in the field of the roof, secured through ribs to supports at 12 inches on center.

                                                ———

Inspector                           Date
2.     Decking at corners (10 feet square) and perimeters (six feet width, or two deck panels, what ever is less) secured through ribs to supports at 6 inches on center.                                                

Inspector                                Date
3.     Decking side laps attached to supports, and secured between supports at 3 feet on center maximum.                                                

Inspector                                Date
4.     All penetrating elements, nailers, parapets and curbs installed.                                                

Inspector                                Date
5.     All receiving surfaces free of splinters and protruberant fasteners.                                                

Inspector                                Date
6.     Deck is free of moisture and debris.                                                

Inspector                                Date
7.     Verify drains are unblocked.                                                

Inspector                                Date
 

Adhered Membrane

 

8.     Insulation boards are not crushed.

                                                

Inspector                                Date
9.     Install tapered edge strips to form crickets.                                                

Inspector                                Date
10.  Insulation boards to  be half width or greater.                                                

Inspector                                Date
11.  Insulation boards with 3/4 inch minimum edge bearing along upper flanges of the metal deck.                                                

Inspector                                 Date
12.  Insulation boards butted together.                                                

Inspector                                Date
13.  Fill insulation joints greater than 1/4 inch.                                                

Inspector                                Date
14.  Isocyanurate boards are glass faced.                                                

Inspector                                Date
15.  Insulation boards are FM approved with membrane.                                                

Inspector                                Date
16.  Insulation fasteners installed every 2 square feet.                                                

Inspector                                Date
17.  Insulation fasteners through metal deck upper flanges.                                                

Inspector                                Date
18.  Sumps formed about drain.                                                

Inspector                                Date
19.  Insulation fasteners driven flush to the top of the insulation without crushing or breaking the insulation surface.                                                

Inspector                                Date
20.  Along perimeters and corners, insulation fasteners increased by 50 percent.                                                

Inspector                                Date
21.  Loose lay sheet without stretching.                                                

Inspector                                Date
22.  Sheets allowed to relax 30 minutes minimum.                                                

Inspector                                Date
23.  Sheet seams 4 inches minimum.                                                

Inspector                                Date
24.  Temperature of liquid adhesives and sealants 60 degree F minimum.                                                

Inspector                                Date
25.  Fold EPDM sheet back 10 feet without wrinkles or buckles.                                                

Inspector                                Date
26.  Bonding adhesive stirred 5 minutes minimum (scrapping sides and bottom).                                                

Inspector                                Date
27.  Surfaces to be bonded are clean and dry.                                                

Inspector                                Date
28.  Bonding adhesives applied evenly without globs or puddles with mechanical roller dispenser.  Bonding adhesive applied to both insulation and sheet at 120 square feet per gallon to each surface.  (Do not apply to seam surfaces).                                                

Inspector                                Date
29.  Operation discontinued if condensation forms on adhesives.                                                

Inspector                                Date
30.  Roll coated sheet on to coated substrate without wrinkles.                                                

Inspector                                Date
31.  Bonded half of sheet brushed with a soft bristle broom.                                                

Inspector                                Date
32.  Fold back unbonded half of sheet and repeat bonding process.                                                

Inspector                                Date
33.  Install adjoining sheets in the same manner, edges overlapped 4 inches minimum, and formed with the flow of water.                                                

Inspector                                Date
34.  Seams formed outside of sump.                                                

Inspector                                Date
35.  Splice area cleaned by scrubbing with Sure-Seal HP splice wipe or clean natural rags saturated with Sure-Seal splice cleaner.  Extra cleaning required at factory seams.                                                

Inspector                                Date
36.  Cleaned material solid black in color with no streaking.                                                

Inspector                                Date
37.  Top sheet held back during cleaning process.                                                

Inspector                                Date
38.  Splicing cement stirred for 5 minutes minimum, scrapping sides and bottom.                                                

Inspector                                Date
39.  Splicing cement applied to both mating surfaces with 4 inch wide 1/2 inch medium nap roller.  Adhesive applied smoothly, continuously, and uniformly to achieve a heavy coat.  Adhesive not allowed to glob or puddle.                                                

Inspector                                Date
40.  At corners and angles, splicing cement applied with 1/2 inch thick paint brush to achieve a smooth surface without brush marks.                                                

Inspector                                Date
41.  Splicing cement applied at the rate of 100 linear feet per gallon.                                                

Inspector                                Date
42.  Splicing cement allowed to dry until it is tacky, but will not stick or string to a dry finger touch and will not be moved when pushed with a dry finger.                                                

Inspector                                Date
43.  If splicing cement over dried, fresh coat of splicing cement applied at half the rate.                                                

Inspector                                Date
44.  Just before closing splice, bead of In-Seam Sealant between 1/8 and 1/4 inch applied a minimum of 1/2 inch from the inside edge of bottom sheet and a minimum of 2 inches from the lead edge of the top sheet.                                                

Inspector                                Date
45.  Sure-Seal HP splice wipes or Natural cloths contaminated by In-Seam Sealant not reused for application of splice cleaner.                                                

Inspector                                Date
46.  Top sheet rolled onto mating surfaces without stretching or buckling.                                                

Inspector                                Date
47.  Seam wiped with hand toward edge.                                                

Inspector                                Date
48.  Splice immediately rolled with a 2 inch wide steel roller with positive pressure toward outer edge.  Roller not run parallel to seam.  In-Seam Sealant remains evident and sensitive to the touch.                                                

Inspector                                Date
49.  Wait two hours minimum, but before end of work day, probe seam.                                                

Inspector                                Date
50.  Sure-Seal HP splice wipe or clean cloth dampened with splice cleaner used to clean the dry splice edge at least 1 inch beyond both sides of seam edge.                                                

Inspector                                Date
51.  5/16″ bead of lap sealant applied to completely cover splice edge.                                                

Inspector                                Date
52.  Lap sealant feathered with Carlisle tool.                                                

Inspector                                Date
53.  RUSS (6 inch minimum wide reinforced 0.045 inch EPDM) installed along perimeter, sections, expansion joints, curbs, and rising walls with gaps between strips not exceeding 1 inch.                                                

Inspector                                Date
54.  RUSS fastened with Carlisle fasteners – through seam fastening plates to metal deck at 12 inches on center maximum, and pre-drilled holes in 6 to 9 inches from corners.                                                

Inspector                                Date
55.  RUSS cleaned in accordance with membrane splices.                                                

Inspector                                Date
56.  Membrane spliced to RUSS in accordance to membrane splices.                                                

Inspector                                Date
57.  Vertical field seams at curbs and walls overlaid with 6 inch wide uncured Elastoform flashing.                                                

Inspector                                Date
Remarks:

Subcontractor

 Contractor Client
Name: Name: Name:
Signature: Signature: Signature:
Date: Date: Date:

 

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