https://unknownportal.com/videos/watch/ae92a601-76f3-49db-8ff9-3d7755bbfaf4 Tape 1 of 3: Inspection of the sprayed-on fireproofing on floor trusses of floors 23 and 18, viewed from floors 22 respectively 17 of North Tower (WTC 1). Recorded on July 7, 1993. Note that there's conflicting information about the recording date between the tape info derived from NIST WTCI Tapes Database and the date superimposed on the footage (July 1st, 1993). 0:03 - 22nd floor, ceiling over Suite 2265, WTC 1. 1:32 - 17th floor, ceiling over Suite 1701 (?), WTC 1. 4:20 - 17th floor, ceiling over Suite 1723 (?), WTC 1. Unknown videographer/Morse Zehnter Associates? Note the green-dyed fireproofing. "Several materials were considered for the sprayed thermal insulation. The exterior columns required insulation not only for fire protection but also to control column temperatures under service conditions. Alcoa recommended for the exterior columns the use of a sprayed material produced by U.S. Mineral Products, Co. known as CAFCO BLAZE-SHIELD Type D. The same material was eventually selected for the floor trusses and core beams and columns. This product, however, contained asbestos fibers. On April 13, 1970, New York City issued restrictions on the application of sprayed thermal insulation containing asbestos. The use of CAFCO BLAZE-SHIELD Type D was discontinued in 1970 at the 38th floor of WTC 1. The asbestos-containing material was subsequently encapsulated with a sprayed material that provided a hard coating. A green dye was added to the encapsulating material so that the asbestos containing SFRM could be identified. Thermal protection of the remaining floors of WTC 1 and all of WTC 2 was carried out using CAFCO BLAZE-SHIELD Type DC/F, a product that contained mineral wool (glassy fibers) in place of the crystalline asbestos fibers. On the basis of tests, it was reported that the thermal properties of CAFCO Type DC/F were equal to or "slightly better" than those of CAFCO Type D." [NIST NCSTAR 1-6A: Passive Fire Protection (Sept. 2005), pp. xxxv & xxxvi / PDF pp. 37 & 38, URL: http://www.nist.gov/manuscript-publication-search.cfm?pub_id=101041] Source of FOIA file: Website: 911datasets.org Folder: International_Center_for_911_Studies_NIST_FOIA 1st Lv. Subfolder: Release_30 2nd Lv. Subfolder: Release 30 3rd Lv. Subfolder: 42A0351 - G30D5 4th Lv. Subfolder: VIDEO_TS File: VTS_01_1.VOB File size: 458 MB Mirror link to Release 30 BitTorrent file: https://web.archive.org/web/20170424103320/http://www.911datasets.org/index.php/NIST_FOIA_09-42_-ic911studies.org-_Release_30 Original MPEG-2 video has been deinterlaced, denoised and upscaled to 2160p. Fame rate doubled. Color saturation and levels have been adjusted. Frame has been re-centered by cropping the frame borders and resizing to 640x480 px by preserving the 4:3 aspect ratio before upscaling. Audio volume increased by 15 dB and audio has been slightly denoised. Audio delay of +64 ms has been corrected. Information on record from NIST WTCI Video Tapes Database (file: "Copy of Video_List.mdb"): Tape ID: 510 Video ID: 231 Tape Name: "W.T.T. #1 Floors 17 & 22 Pre-abatement Inspection #9025 - 7/7/93" Tape Source: Isolatek Notes: "From Monica Starnes Fireproofing inspection from litigation PA v. USM" Format: VHS Duration: 8 min Information on record from the NIST WTCI Document Database (file: "tblDocumentMain.xlsx"): Document ID: WTCI-000259-ITK Document title: "Fireproofing WTC 1 - floors 17 and 22 - 7/7/93" Reupload with improved features, after YouTube has destroyed my initial upload from Oct. 31, 2013 due to creating nasty video blocking artifacts when it did re-encoding of videos around 2016, apparently for tighter H.264 video compression. Link: https://youtu.be/F-ZgcWDGHcc (video is set to Unlisted mode now). Tue, 10 Nov 2026 00:42:15 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://unknownportal.com https://unknownportal.com/lazy-static/avatars/8e1b22ce-9e45-498c-bf3b-05cc77b487a2.gif https://unknownportal.com/videos/watch/ae92a601-76f3-49db-8ff9-3d7755bbfaf4 All rights reserved, unless otherwise specified in the terms specified at https://unknownportal.com/about and potential licenses granted by each content's rightholder.