ᐅ Install vapor retarder around collar beam with rafter tie anchor

Hello everyone,

I want to install a vapor barrier around the collar beam. Unfortunately, there are several issues. For example, the rafter purlin anchor is in the way. I’ve already tried taping around it, but I found that the membrane isn’t airtight that way.

I have some ideas, but I’m quite uncertain. A simple but perhaps unsightly solution would be to saw through the anchors and bend the metal parts that are in the way. The rafters are mainly fixed to the collar beam at other points. Ideally, the anchors could be moved to the back side of the central purlin. Alternatively, this problem could be solved differently by installing OSB panels in the cavities and then sealing everything around with reinforced tape.

What’s your assessment, or what ideas would you have?

Thanks and best regards

Billie

Maybe it’s not clearly visible in the picture, but what do you hope to achieve by sealing that hole? If this is going to be an attic conversion, it’s better to create a separate building envelope.

Hello, thank you for your response. Of course, that is one way to do it. The only argument for using a membrane in the gaps is to protect against dust and weather. However, you can also use something else for that.

Best regards

Billie