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Week 7 The Steel Roof Beam

Susie

Entry posted by Susie in General

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On Monday the second gable is poured and most of the internal bracing, corner bracing and window shuttering is removed.

Tuesday rains all day so no work on site.  The internal floor is under 1 inch of water with no way to escape, without us brushing it towards soil pipe.  Good to know we are airtight at the floor/wall joint.

The steels are installed, we were supposed to have wooden roof beams but somehow this was not calculated by the architect who insisted the roof truss company would do the calculations later.  The roof truss companys only want to do the calculations when they know you are ready to order and they said the beam spans could not be done.  So on the last minute we had to go back to the SE who worked out our steel beams and the total cost of roof went up £8k.  I wish the architect had suggested the SE looks at the roof calculations earlier but unfortunately we just have to move on from this, and up to this point we have had no other extra costs.

Since we are no longer working with the architect I have had to find a new SAP assessor who I can engage with as the build progresses.  We have been discussing how changing the steel beam might change things as the vaulted ceiling can now be higher if we want.  This gives us more space to heat up. I also wanted to know the effect of not putting as much solar on the roof or not having the wood burner changes the SAP results.  Since having a smart meter fitted at home we have reviewed our current electric usage and decided that less solar (7.5 kwp instead of 11 kwp) but with the ability to add a battery.

Also I think aesthetically one row of 15 panels will look better.

 

Total Man days of labour week 7 is 16 days.

 

Total to date b/f £44925

New Design Stage SAP Calculations (previously done by architect) with ongoing advice about changes that will affect the SAP and to include the As Built SAP documents and EPC at completion £720.  It does seem a lot compared to online prices but for peace of mind knowing that we can if we choose to only put 6kwp of PV on the roof instead of 11kwp, is an overall saving.

Total to date  £45645

 

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Edited by Susie

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mike2016

That looks like a slightly scary prop for the ridge steel but I'm sure it's ok!! Just don't slam the door too much!!!! Great work and hope you're enjoying the paddling pool! We had to knock out a corner of the foundation as it was taking too long to brush out a hole we'd drilled which would get clogged up fast. The soil pipes weren't cut down at that point. Hopefully no ducks made their home there?! It's those calculations and little gaps that can cause such headaches, well managed though! 

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Susie
13 hours ago, mike2016 said:

That looks like a slightly scary prop for the ridge steel but I'm sure it's ok!! Just don't slam the door too much!!!! Great work and hope you're enjoying the paddling pool! We had to knock out a corner of the foundation as it was taking too long to brush out a hole we'd drilled which would get clogged up fast. The soil pipes weren't cut down at that point. Hopefully no ducks made their home there?! It's those calculations and little gaps that can cause such headaches, well managed though! 

The doorway has no door on this opening only on the next one, and the walls are now built up further.  It has now dried out, even got to lay down where the beds will go to check the view out and ceiling angles. 
Very happy with the work so far from the builders. 

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JohnMo
18 hours ago, mike2016 said:

That looks like a slightly scary prop for the ridge steel but I'm sure it's ok!!

The loads imposed will be purely downwards and any sideways loading is taken by the cable ended. So all it's doing is limiting the downwards droop of the steel.

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Gus Potter
On 02/11/2024 at 18:18, mike2016 said:

That looks like a slightly scary prop for the ridge steel but I'm sure it's ok!!

It will be scary if it's not properly restrained against not least movement in the direction of the ridgeline... in fact likely dangerous.

5 hours ago, JohnMo said:

The loads imposed will be purely downwards and any sideways loading is taken by the cable ended. So all it's doing is limiting the downwards droop of the steel.

John you have a number of pivot points (like rocker bearings) and due to the nature of steel fabrication and behaviour it will tend to buckle sideways due to the vertical load. I can see where you are coming from ( gables taking out the wind load I assume) but it is very important that this arrangement of steel has solid restraint against moving in the direction of the ridge and also perpendicular to the ridge.

 

Please check your SE drawings and make sure you follow them religiously.. don't let the builder / steel fabricator go off and do their own thing. Do this before you load up the roof further. If in doubt get some temporary bracing in.

Edited by Gus Potter
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Susie

Hopefully when I publish last weeks photos showing the wall built up around the goal posts and that the rafters now have collars on them, all is well. 
Thank you for all your concerns I will double check all the details. 
We have not got as far as the OSB yet so it is all still visible to check. 
 

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