The Association for Preservation Technology International (APT)

We're back with another webinar available on YouTube! Architectural Coatings in a Historical Context by Mary Jablonski of Jablonski Building Conservation, Inc. & produced by The Association for Preservation Technology International (APT) & the National Center for Preservation Technology and Training can be viewed here: https://lnkd.in/gYapMD27 Thank you to the National Center for Preservation Technology & Training for their generous support in helping make these videos possible. What other topics would you like to see on our channel? #historicpreservation #heritagematerials #historicmaterials

The Preserving the Recent Past 4 (PRP4) conference, to be held from March 19 through 22 in Boston, will offer a national forum to share the latest strategies for identifying, protecting, and conserving significant structures and sites from the recent past. Prospective speakers are encouraged to submit abstracts. To learn more: https://lnkd.in/ejcczpFj #historicpreservation #conservation

It's Thursday which means it's Archive Thursday! Today we're testing a theory. APT’s catalogue/publications library can help solve your historic construction method questions. For example, in 1936 a log lodge was made of materials locally available in the mountains of Montana – with the possible exception of the poured concrete visible at the wainscot of the interior walls. The exterior granite fieldstone base is dry-stacked, with scant pockets of mortar. This exterior stone extends three feet below grade and is visible in the crawlspace. But the portion of wall visible at the living level is of board-formed concrete which extends to provide a bearing ledge for the floor joists. The log walls sit atop the stone and concrete. The question is: Could the exterior stone have been the exterior formwork for the concrete wall? A log cabin publication from 1948 includes a drawing of such a construction method, modified to provide a concrete – not stone – foundation wall. Concrete was likely more costly than the labor-intensive stone. Another condition – cuts across the logs – occurred on the long logs of some of the walls. A 1945 USDA Forest Service publication provided the answer for this question. The sawcuts straighten out curved logs. APT’s Building Technology Heritage Library has a variety of publications that can help with the conundrums that occur during building investigations. Download these catalogues from the APT Building Technology Heritage Library at: https://lnkd.in/eem2_XcS. #ArchiveThursday #HistoricPreservation

👉 IN-PERSON WORKSHOP Join Rocky Mountain Chapter of the Association for Preservation Technology, CU Denver College of Architecture & Planning + The Association for Preservation Technology International (APT) for our next in-person workshop: Protecting and Responding: Contemporary Documentation of Cultural Heritage to be held in Denver, Colorado, on Saturday, September 21. The workshop will feature experts who will present on the use of laser scanning, drones, and non-destructive evaluation methods to assess and preserve historic structures. We’ll also explore contemporary tools and techniques through the lens of natural disasters. This event offers a valuable opportunity for professionals and students to learn about cutting-edge technologies while networking with peers in the field. Don't miss this exciting opportunity to connect with your colleagues. Learn more: https://lnkd.in/gdUPf5-f

DID YOU KNOW? We're updating our YouTube channel with webinars! Have you watched our Laboratory and Field Studies of Concrete and Mortar webinar by Karla Salahshour produced by APT - The Association for Preservation Technology International & National Center for Preservation Technology and Training? https://ow.ly/PgHt50SCjsN Thank you to the National Center for Preservation Technology & Training for their generous support in helping make these videos possible. What other topics would you like to see on our channel? #historicpreservation #heritagematerials #historicmaterials

📣 MAJOR ANNOUNCEMENT -- Early Bird Registration is now LIVE for the APT - National Trust for Canada Joint Conference Montreal 2024! Learn more about conf & register today - https://lnkd.in/dFxKvZ7d Tag those you'd love to join us or share the news with your colleagues.

We're back with another Archive Thursday (on Friday, due to technical difficulties!). Today we ask, "what’s in a name"? Are cinder blocks and concrete blocks the same thing? (Spoiler alert - keep reading because we want to hear your stories about this topic!) While used interchangeably by many, “Cinder block” and “Concrete block” are not the same. Catalogues for these manufactured products show that while the shapes are similar, their properties are not. In comparison to concrete block, cinder block is lighter weight, lower in tensile and compressive strength, and has better insulation and sound absorption qualities. The primary difference of one ingredient creates these deviations in characteristics. Concrete block is comprised of Portland cement, water, and sand/gravel/crushed stone. Cinder block is comprised of Portland cement, water, and coal ash. Coal ash was a plentiful industrial waste product from burned coal coke ovens at large facilities such as those for Bethlehem Steel. The difference in composition results in differing weights and strengths, with concrete blocks weighing 42-55 pounds each and cinder blocks weighing 25-35 pounds each. Compressive strengths – and concomitant suitability for building uses – are up to 5,000 psi and 1,500 psi, respectively. This explains why cinder blocks were useful for retaining/garden walls and interior partitions and not for more substantial load-bearing construction . So, how can we tell them apart? We know that cinder blocks have a rough-textured, grey surface that nails can be driven into. Cinder block isn’t colored like concrete block often is. We hope that those of you who have had experience with cinder block will share your stories. in the comments! APT’s Building Technology Heritage Library has a host of catalogues advertising concrete and cinder blocks, some less clear in the distinction. Download these catalogues from the APT Building Technology Heritage Library at: https://lnkd.in/eem2_XcS. #ArchiveThursday #HistoricPreservation #CinderBlocks #ConcreteBlocks

👉 RESOURCE ALERT! 👈 Did you know for a limited time you can access previously-recorded webinars? If you missed the sessions from our popular Technical Committee on Sustainable Preservation Webinar Series, you can still gain access to the recordings for a limited time. June 11: Webinar 1 - Historic Building Envelopes and Deep Energy Retrofits June 18: Webinar 2 - Insulation Retrofits, Foundations and Leak Mitigation July 16: Webinar 3 - Historic Window Upgrades: Wood, Steel and Vacuum Insulated Glass Click here to learn more: https://lnkd.in/gMYYQJiy #sustainableenvelopes #historicpreservation #insulationretrofit #historicwindows

👉 TODAY! It's the 3rd in the webinar series on Sustainable Repair and Retrofit of Historic Building Envelopes. July 16: Historic Window Upgrades: Wood, Steel and Vacuum Insulated Glass (noon to 2 p.m. Eastern) To learn more or register: https://lnkd.in/gMYYQJiy #sustainableenvelopes #historicpreservation #historicbuildings

FINAL CALL! Today is the last day to submit an application for the Dean Koga Outreach and Education Prize! The APT Prize will be announced by August 30, 2024. https://bit.ly/DeanKoga Good luck to all the applicants! #historicpreservation #DeanKoga