New lifts in existing town houses
The lift walls perpendicular to the strip foundations are heavily loaded. And this while the strip foundations are already very heavily loaded on paper because of the increased (design) values for variable loads. Without extra measures, the strip foundations are then often overloaded. A practical and economical measure is to spread the load parallel to the strip […]
Read moreStrengthening a bathroom floor on Bethlehemweg in Utrecht
During the bathroom renovation, the contractor noticed excessive deflection of the timber joists and asked De VerbouwingsConstructeur for advice. We found: Undersized timber joists: 70×150 mm over a span of 4,500 mm, with varying centres of up to 600 mm. In the […]
Read moreThermal resistance calculation
Thermal resistance of 60×160 timber rafters at 660 mm centres. Build-up: rafters with insulation between them, plasterboard below and roof boarding above λtimber = 0.17 W/[mK] Rtimber = 0.16 m/0.17 {W/[mK]} = […]
Read morePallandtdreef Culemborg
Here the architect had not required the structural depth to be limited to the original floor thickness. This made spans of about 7.5 m possible with a cambered HEB240 beam, forming part of a new T-piece under the existing rear and side walls. In the front […]
Read moreWall openings in Maarssen
At the start of this project, the client wanted a clear span of more than 7 m to the new rear wall and, perpendicular to it, another opening through to the kitchen. We were able to convince the client that such a large opening would be expensive and difficult: The spanning beam becomes very deep The supporting columns also […]
Read moreRaising a floor
Because the large basement was very low and the ground floor very high, we raised a timber floor on Monseigneur van de Weteringstraat in Utrecht. We paid extra attention to resisting possible horizontal forces, installing temporary horizontal propping before an arched structure was […]
Read moreResidents’ review: strengthening a house in Sliedrecht
Second opinion on existing calculations for an extension For our 1930s house, we asked De VerbouwingsConstructeur for a second opinion on calculations made by others for a renovation. The work involved opening up a rear wall, installing a portal frame and building a new extension. Following the second opinion, De VerbouwingsConstructeur recommended further […]
Read moreWide two-storey extension
I designed an extension eight metres wide and 2.5 metres deep over two storeys, on piled foundations. On the ground floor, a wall perpendicular to the existing rear wall, carrying a heavy concrete first floor, was replaced by a steel beam about […]
Read moreReport: assessment of cracking
Dear Mr Siemelink, Thank you for your quick response and the excellent work on the structural survey of the house on Tuinbouwstraat in Utrecht. I was given your name following a building survey of the house mentioned above. I have been trying to sell this house since 1 January 2017. […]
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