GrantMcscott Posted August 16, 2021 Share Posted August 16, 2021 Hi Just noticed that there are no rafter ties holding the roof to the wall header. I now can not install then due to insulation being fitted. Can I use Builders Band to do it at intervals where marked in yellow or something else or do i need to do anything thanks Link to comment Share on other sites More sharing options...
markc Posted August 16, 2021 Share Posted August 16, 2021 I would remove the insulation and fit the ties, a well insulated roof sitting in the street won’t do you much good in a storm. Link to comment Share on other sites More sharing options...
Mr Punter Posted August 16, 2021 Share Posted August 16, 2021 Have they not used truss clips? Maybe on the outside of the wall plate? Find out from the timber frame company. This is their responsibility. Link to comment Share on other sites More sharing options...
GrantMcscott Posted August 16, 2021 Author Share Posted August 16, 2021 11 minutes ago, Mr Punter said: Have they not used truss clips? Maybe on the outside of the wall plate? Find out from the timber frame company. This is their responsibility. They have not used them we made the frame ourselves and there is a long story about it for another time. Was going to use the attached and using twisty nails to nail it to the wall and the truss where it goes up at an angle Link to comment Share on other sites More sharing options...
Mr Punter Posted August 16, 2021 Share Posted August 16, 2021 19 minutes ago, GrantMcscott said: They have not used them we made the frame ourselves and there is a long story about it for another time. Was going to use the attached and using twisty nails to nail it to the wall and the truss where it goes up at an angle You will need to ask Building Control if that would be acceptable. You may also need to submit calcs for the timber frame. Link to comment Share on other sites More sharing options...
Declan52 Posted August 16, 2021 Share Posted August 16, 2021 Think your going to have to use wall plate straps. The builders band is no where near strong enough to keep your roof attached to the walls. It's only a few bits of insulation to take out. Lucky it's been found now and not after it's been plastered up. Link to comment Share on other sites More sharing options...
GrantMcscott Posted August 16, 2021 Author Share Posted August 16, 2021 (edited) 18 minutes ago, Declan52 said: Think your going to have to use wall plate straps. The builders band is no where near strong enough to keep your roof attached to the walls. It's only a few bits of insulation to take out. Lucky it's been found now and not after it's been plastered up. The photo is just a small part of it is massive but at least some of the roof is in a portal frame so no need to do it there. I think but would need to look to see if they have nailed them to the header. Have mailed my Architect he does not seem concerned in using the band on every truss Edited August 16, 2021 by GrantMcscott Link to comment Share on other sites More sharing options...
GrantMcscott Posted August 16, 2021 Author Share Posted August 16, 2021 Just read NHBC guide and as the roof has no to little uplift as there is no soffits outside. From NHBC Site Where trussed rafter roofs are not subject to uplift, a minimum of two 4.5mm x 100mm galvanized round wire nails, skew nailed, one on each side of the trussed rafter, or truss clips (fixed in accordance with the manufacturer’s instructions) are acceptable. Link to comment Share on other sites More sharing options...
epsilonGreedy Posted August 16, 2021 Share Posted August 16, 2021 3 hours ago, GrantMcscott said: Just read NHBC guide and as the roof has no to little uplift as there is no soffits outside. What pitch is the roof? I ask because lift can occur at the ridge, hips and other parts of the roof due to aerodynamic lift. Link to comment Share on other sites More sharing options...
GrantMcscott Posted August 17, 2021 Author Share Posted August 17, 2021 14 hours ago, epsilonGreedy said: What pitch is the roof? I ask because lift can occur at the ridge, hips and other parts of the roof due to aerodynamic lift. Hi it is 41 degrees Link to comment Share on other sites More sharing options...
epsilonGreedy Posted August 17, 2021 Share Posted August 17, 2021 (edited) 2 hours ago, GrantMcscott said: Hi it is 41 degrees Ok. A low pitched roof (below 30 degrees) is more prone to lift but vorticies can form in unexpected locations due to aerodynamic lift. It would be wrong to think that the only danger of a roof lifting off is the wind catching effect of a soffit. Edited August 17, 2021 by epsilonGreedy Link to comment Share on other sites More sharing options...
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