To provide a decent amount of headroom in the new bedroom the collars which spanned across the rafter at approximately 1.9m were moved upwards to 2.4m but renewed in C16 structural timbers 145mm x 47mm, bolted through with M12 Grade 8.8 bolts and toothed plate connectors.
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| This is the 1.9m height of the collars as the roof trusses were originally constructed. |
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| The new C16 collars were cut and fitted in place temporarily and then string lined, levelled and marked to ensure a level fitting across the width and length of what will be the new ceiling. |
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| The existing collars remained in place whilst the new ones were fitted. This made the fitting a wee bit awkward but it meant there was no movement in the roof trusses at all. |
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| Once the new collars were lined up and marked, 13mm holes were bored through them and the existing trusses,toothed plate connectors were fitted between the timbers and then the M12 bolts were used to bolt the timbers together. |
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| Once sufficient torque had been applied to the bolts and the toothed connectors were bitten into the timbers the old collars were removed and set aside for reuse elsewhere in the conversion. |
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| The extra 500mm in height makes a considerable difference to the feeling of spaciousness already. |
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