Roof strap conundrum

[Roger440]

Im doing some work on the roof of my house.

 

However, its come to light that there appears to be nothing holding the roof down on the extension. There were a couple of straps nailed to a rafter and down into the wall plate. Which clearly isnt much use when the nails are in the vertical plane! They just pulled off by hand.

 

The work has introduced ventilation via the eaves that was previously blocked off. Which was causing some condensation isues unsurprisingly.

 

The house is reasonably exposed, ive introduced ventilation, therefore wind into the roof, and theres little holding it down. Which is sub optimal.

 

The front half of the house has 2 massive purlins that are embeded into 2 ft thick stone gables. So theres no realistic risk of the roof being pulled upwards.

 

The extension roof is at 90 degrees to the original part and all tied in and nailed together.

 

Ive been up into the gable end of the extension, put a strap on off the ridge beam onto the gable wall, and, addtionally, the end rafter has diaganols down to the ceiling joist. Ive bolted these to the gable wall too. 

 

So, im happy the gable end is pretty secure, the other end is well tied into the existing roof.

 

Its the bit in the middle thats troubling me. The wall plate is on the outer leaf with birdsmouth to clear the inner leaf. No straps to be seen. My current thougts for retrospective installation is on the inside wall and screw to rafter . The ceiling has the 45 degree slopy bit on the inside so can do all of it from inside.

 

However, as one might imagine, this involves making a mess of the bedroom, and so there is pressure to not do so.

 

Am i over worrying?

 

The roof is quite lightweight, 75mm rafter and composite roof tiles.

 

Thoughts please?

[Mr Punter]

Is the wall plate strapped down?  If so, you may only need a truss clip or structural screw to fix each rafter / truss to the wall plate.

[Roger440]

2 hours ago, Mr Punter said:

Is the wall plate strapped down?  If so, you may only need a truss clip or structural screw to fix each rafter / truss to the wall plate.

No, its not. Thats my issue.

 

 

[ETC]

Strap the wall plate down with 30mmx5mmx1000mm long wall plate straps at maximum 2.0m centres.

Install gable and ceiling straps at the same centres across three rafters/ceiling joists.

[Roger440]

1 hour ago, ETC said:

Strap the wall plate down with 30mmx5mmx1000mm long wall plate straps at maximum 2.0m centres.

Install gable and ceiling straps at the same centres across three rafters/ceiling joists.

 

I may not have explained myself well.

 

The house is already built, this bit 40 years ago. 

 

I cant access the wall plate, at least not without removing some roof, and even then, it would have to be on the outside of the wall.

 

Yes, its true i could see the top of the wall plate whilst doing the work, but that didnt really help as id still have the issue of the vertical part of the strap being visible.

[Nickfromwales]

Looks like you'll end up popping a few tiles off, and then drilling down with a 600mm sds bit at 10mm dia, and then resin bolting the wall pate down.

 

You know the only other option is to cut some slices out of the interior......