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Yes. it is a unit ventilator on the second-story above. I think that is what it is from. You think just condensation from the unit (i'm not an HVAC guy)? Thanks.

In the attached photos is the north elevation of a 2-story school addition. CMU exterior walls. Steel floor/roof framing. Vertical stains are below a second-story joist bearing at north exterior wall (see dashed outline in Photograph 1). No streaks are below any of the roof framing members...

@dylansdad: yes, there are several others all behaving in the same way. Thank you.

Hello. I have a wood-framed fink truss. A rough sketch is attached. As you can see in the sketch, the top/bottom chord interface at the left hand side is not at a support. This is where failure occured, which I attached a photo of (note that a temporary wall is now in place below the failure...

Hello Engineers. I have a 5-story condo building (no drawings, no site visit). I don't know what the floor framing is. Floor framing reportedly spans 24 feet. At the back side of one of the units I have a localized floor deflection of 1/2 inch over the last 4 feet from the sliding glass door...

Hello. When I see large deflections on chimneys rather than brittle failure, I start to think that the mortar is a lime putty mortar vs. portland cement mortar. Short of doing a vinegar test, or scraping to identify white inclusions vs. white aggregate, can you tell just by looking at the...

I have opposing 2x6s meeting at spliced 2x6 ridge board. Is there a code section (IRC) that references this detail, and if so, what code section is it? Should a vertical support be provided at ridge boards abutting? I attached one pic. Thanks...

Hello. I have a warehouse wall about 18 feet high built in the 1960s. Don't know reinforcing, cell grouting, block width. I have horizontal cracks with lateral displacement between windows. I have a CMU cracked vertically with inward horizontal displacement. There is no unbalanced soil...

@dhengr: the rafters are 17-ft long on the slope.

Hello. I have two rafters in a log cabin structure that are fractured near the ridge. The two affected rafters oppose each other. The rafters are not water-stained and fractures are not in areas of knots. The rafters span about 17 feet on a 12:12 pitch roof. The rafters are about 3 wide, 7 1/2...

Hello. I have two rafters in a log cabin structure that are fractured near the ridge. The two affected rafters oppose each other. The rafters are not water-stained and fractures are not in areas of knots. The rafters span about 17 feet on a 12:12 pitch roof. The rafters are about 3 wide, 7...

Please see attached photo. I have a cracked lintel. The cracking is about 1/16 inch wide and is horizontal across the lintel's length (at about mid-height). Lintel span is about 5 feet. Stucco above is not cracked. The lintel supports CMU above. This is an early 1900s house with exterior...

@phamENG. The pdf came from here, https://www.iccsafe.org/wp-content/uploads/bcac/IRC_Section_507_Deck_Strawman_10-22.pdf. thank you.

Thank you in advance for reading my question on wood-framed decks. Figure R507.10.1 is not in the version of 2012 IRC that I have (digital or PDF). This figure illustrates diagonal bracing requirements for free-standing decks greater than 30 inches above grade. The figure is in another PDF I...

Hi. I have a pre-engineered building (about 25x60) with steel frames spaced about 5 feet on center. Frames are constructed with tube steel. The frame is continuous at ridge. The ridge condition is shown in attached photo. What is the general terminology used to describe this condition of...

Hello Group. Looking for the simplest way to analyze the attached frame by hand. Please provide your best "down and dirty" or "back of the napkin" type analysis. Thank you for your time...

Hi, I have pre-engineered wood trusses, mfr. unknown. 50' spans. After a fire, approximately 6 feet of bottom chords of three trusses are gone, and vertical and diagonal web members above the missing bottom chords are heavily charred. Considering that I do not know the mfr., I am airing on...

Hi all, Thanks for reading, please see attached pictures. Single wide trailer with a ceiling crack across the entire 14' width. Crack is parallel to a partition. Considered snow load as culprit but not enough snow to cause damage to a competent structure. Could the damage shown in the...

Please see attached sketch. The dashed red lines in the sketch distribute the weight of the wall (vertical red arrow) for greater stability. The angle of the red lines depends on the soil composition. What happens if the black hashed line of soil is removed from an outer edge of the wall as...

Hi all, I typically use 100 psf for surcharge loading if a residential driveway is behind a retaining wall. This accounts for light traffic and parking. Is there a code reference out there for this load used, and can you provide it? Thanks.