This article is about HEATING, VENTILATING AND AIR CONDITIONING DUCTWORK and focusing to the engineers, technicians and supervisors. You will find lot of documents related to this article. Just navigate our website www.paktechpoint.com and find more articles. Please! Do not forget to subscribe our You tube channel also. Thanks in Advance.
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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 |
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Inspection Attribute | Acceptable | Remarks | ||||||
General Requirements
1. Decking in the field of the roof, secured through ribs to supports at 12 inches on center. |
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Inspector Date |
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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. |
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3. Decking side laps attached to supports, and secured between supports at 3 feet on center maximum. |
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4. All penetrating elements, nailers, parapets and curbs installed. |
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5. All receiving surfaces free of splinters and protruberant fasteners. |
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6. Deck is free of moisture and debris. |
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7. Verify drains are unblocked. |
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Adhered Membrane
8. Insulation boards are not crushed. |
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9. Install tapered edge strips to form crickets. |
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10. Insulation boards to be half width or greater. |
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11. Insulation boards with 3/4 inch minimum edge bearing along upper flanges of the metal deck. |
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12. Insulation boards butted together. |
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13. Fill insulation joints greater than 1/4 inch. |
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14. Isocyanurate boards are glass faced. |
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15. Insulation boards are FM approved with membrane. |
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16. Insulation fasteners installed every 2 square feet. |
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17. Insulation fasteners through metal deck upper flanges. |
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18. Sumps formed about drain. |
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19. Insulation fasteners driven flush to the top of the insulation without crushing or breaking the insulation surface. |
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20. Along perimeters and corners, insulation fasteners increased by 50 percent. |
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21. Loose lay sheet without stretching. |
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22. Sheets allowed to relax 30 minutes minimum. |
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23. Sheet seams 4 inches minimum. |
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24. Temperature of liquid adhesives and sealants 60 degree F minimum. |
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25. Fold EPDM sheet back 10 feet without wrinkles or buckles. |
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26. Bonding adhesive stirred 5 minutes minimum (scrapping sides and bottom). |
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27. Surfaces to be bonded are clean and dry. |
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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). |
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29. Operation discontinued if condensation forms on adhesives. |
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30. Roll coated sheet on to coated substrate without wrinkles. |
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31. Bonded half of sheet brushed with a soft bristle broom. |
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32. Fold back unbonded half of sheet and repeat bonding process. |
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33. Install adjoining sheets in the same manner, edges overlapped 4 inches minimum, and formed with the flow of water. |
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34. Seams formed outside of sump. |
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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. |
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36. Cleaned material solid black in color with no streaking. |
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37. Top sheet held back during cleaning process. |
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38. Splicing cement stirred for 5 minutes minimum, scrapping sides and bottom. |
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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. |
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40. At corners and angles, splicing cement applied with 1/2 inch thick paint brush to achieve a smooth surface without brush marks. |
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41. Splicing cement applied at the rate of 100 linear feet per gallon. |
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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. |
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43. If splicing cement over dried, fresh coat of splicing cement applied at half the rate. |
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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. |
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45. Sure-Seal HP splice wipes or Natural cloths contaminated by In-Seam Sealant not reused for application of splice cleaner. |
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46. Top sheet rolled onto mating surfaces without stretching or buckling. |
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47. Seam wiped with hand toward edge. |
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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. |
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49. Wait two hours minimum, but before end of work day, probe seam. |
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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. |
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51. 5/16″ bead of lap sealant applied to completely cover splice edge. |
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52. Lap sealant feathered with Carlisle tool. |
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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. |
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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. |
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55. RUSS cleaned in accordance with membrane splices. |
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56. Membrane spliced to RUSS in accordance to membrane splices. |
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57. Vertical field seams at curbs and walls overlaid with 6 inch wide uncured Elastoform flashing. |
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Remarks: | ||||||||
Subcontractor |
Contractor | Client | ||||||
Name: | Name: | Name: | ||||||
Signature: | Signature: | Signature: | ||||||
Date: | Date: | Date: | ||||||